Can You Get Sunburnt Through Clothes? How Fabric, Colour, Stretch and Wetness Affect UV Protection

Yes, it is possible to get sunburnt through some clothing. A garment may cover your skin without blocking enough ultraviolet radiation to protect it effectively. Fabric construction, colour, stretch, moisture, wear and a tested UPF rating all influence how much UV can pass through.

Can you get sunburnt through clothes?

Yes. UV radiation can pass through certain fabrics and reach the skin underneath. Clothing is usually an important part of sun protection, but coverage alone does not guarantee a high level of protection.

A thin white T-shirt, loosely knitted top, sheer cover-up or heavily stretched pair of leggings may allow more UV through than a closely woven or properly tested sun-protective garment.

The risk is influenced by:

• how tightly the fabric is woven or knitted;
• the type and thickness of the fibres;
• the colour and dye;
• how much the garment stretches;
• whether the fabric is wet;
• the age and condition of the clothing;
• how much skin the design actually covers;
• whether the material has a tested UPF rating.

The possibility of sunburn through clothing does not mean ordinary clothing is useless. Many garments provide meaningful protection. The important point is that the amount of protection can vary considerably.

How can UV radiation pass through fabric?

Fabric is made from fibres arranged in a woven or knitted structure. Small spaces remain between those fibres. UV radiation may be absorbed, reflected or transmitted through the material.

A dense fabric structure generally leaves fewer direct pathways for radiation to pass through. A loose, open or sheer construction usually leaves more gaps.

This is why two long-sleeve tops can provide very different levels of protection even though they cover exactly the same part of the body.

Direct transmission through gaps

If a weave or knit has visible openings, some UV radiation may travel through those openings and reach the skin. These gaps can become larger when the fabric is stretched.

Transmission through fibres

The fibres themselves can also absorb or transmit different amounts of UV. Fibre composition, dyes, additives and fabric engineering all influence the final result.

Protection is not determined by thickness alone

A thick-looking garment is not automatically protective, and a lightweight garment is not automatically weak. Modern fabrics can be engineered to be light, breathable and highly protective at the same time.

That is why a tested rating is more useful than judging protection by weight or feel alone.

What affects how much UV clothing blocks?

1. Weave and knit density

Fabric construction is one of the most important factors. Closely woven or knitted materials generally block more UV than loose, open or sheer fabrics.

Think of the fabric as a screen. The smaller and fewer the openings, the harder it is for UV to pass directly through.

This does not mean the fabric has to feel heavy. A lightweight technical fabric can use fine fibres and a dense construction to combine breathability with protection.

2. Fibre type and fabric engineering

Different fibres interact with UV radiation differently. Polyester, nylon, cotton, linen, viscose and blended fabrics can all provide different levels of protection depending on how they are constructed.

It is therefore too simplistic to say that one fibre is always protective and another is not. The final textile matters more than the fibre name by itself.

Manufacturers may improve a fabric’s protection through fibre selection, dense construction, dyeing, specialised finishes or a combination of these methods.

3. Garment coverage

A highly protective fabric only protects the skin it actually covers. A UPF-rated sleeveless top, for example, still leaves the shoulders and arms exposed.

Design features that can increase useful coverage include:

• long sleeves;
• higher necklines;
• collars;
• longer hems;
• full-length trousers;
• thumb loops or extended cuffs where suitable;
• secure fits that do not ride up during movement.

Sunscreen remains important for exposed areas such as the face, ears, hands, ankles, feet and any gaps around the garment.

Do wet clothes protect less from UV?

Some fabrics provide less UV protection when they become wet. Water can change the way light travels through a textile and may make the material more transparent.

This is especially relevant for:

• ordinary cotton T-shirts worn in the water;
• lightweight beach cover-ups;
• clothing soaked with sweat;
• garments repeatedly moving between water and sun;
• fabric that clings and stretches more when wet.

Cancer Council Australia advises that fabric protection can be lower when clothing is wet, depending on the material and how much moisture it absorbs.

Why does a wet white T-shirt become less reliable?

A light cotton shirt may become more transparent when wet. It can also cling to the body, which increases stretching and reduces the air space between the garment and skin.

These combined effects can reduce its usefulness as sun protection.

What should you wear for swimming?

Choose swimwear specifically designed for prolonged sun and water exposure. Long-sleeve swim tops, rashguards, swim leggings and full-coverage swimsuits can reduce the amount of skin that requires sunscreen.

Check whether the garment’s UPF claim is suitable for its intended use, and always apply sunscreen to exposed areas.

Does stretching clothing reduce its sun protection?

Stretching can reduce the protection of a fabric because it pulls the fibres farther apart. This may enlarge the gaps in the weave or knit and allow more UV radiation through.

The effect is particularly relevant for:

• tight leggings;
• close-fitting swimwear;
• elasticised tops;
• garments worn one or more sizes too small;
• fabric pulled tightly across the bust, shoulders, hips or elbows.

Does this mean fitted clothing cannot be protective?

No. Fitted garments can still provide strong protection when the fabric has been engineered and tested for stretch.

The practical issue is whether the material maintains suitable coverage and protection when worn as intended.

Choosing the correct size also matters. Clothing that is excessively tight may not perform or feel as intended, while a comfortable fit supports movement, breathability and coverage.

Do dark clothes block more UV than light clothes?

In otherwise similar fabrics, darker and more saturated colours often absorb more UV radiation than pale colours. This can make a dark version of the same textile more protective.

However, colour is only one factor. A dark, loose-knit fabric may still provide less protection than a pale fabric that has been densely constructed and tested to UPF 50+.

Can white clothing still be UPF 50+?

Yes. White or light-coloured clothing can achieve a UPF 50+ rating when the fabric is designed appropriately.

A protective rating is based on the completed fabric, not on colour alone. Fibre composition, weave, knit, stretch, thickness and specialised textile technology can all contribute.

Can UV pass through different types of clothing?

Can you get sunburnt through a T-shirt?

It is possible, especially through a thin, light-coloured, loose-woven or wet T-shirt. The shoulders and upper back may receive repeated direct sun, making weak fabric protection more noticeable during long outdoor exposure.

A closely constructed or tested UPF shirt provides more confidence than an ordinary lightweight tee with an unknown rating.

Can you get sunburnt through leggings?

Yes, UV may pass through leggings if the material is thin, sheer, heavily stretched or not designed for sun protection.

Check how the material looks when bent or stretched over the knee and hips. If it becomes visibly transparent, its protection may not be reliable.

Can you burn through a dress or cover-up?

Sheer beach dresses, crochet cover-ups, open knits and lightweight gauze may provide shade and modesty without offering high UV protection.

A cover-up should not automatically be treated as sun-protective unless its fabric construction and rating support that use.

Can you get sunburnt through swimwear?

Ordinary swimwear covers only limited areas and may not have a stated UPF rating. Purpose-designed sun-protective swimwear offers more coverage and more predictable fabric performance.

The skin around leg openings, zips, necklines and sleeve edges can remain exposed, so careful sunscreen application is still necessary.

Can you burn through a hat?

UV can pass through loosely woven, open or damaged hat materials. Some straw-style hats contain visible holes that allow direct light through.

Hat protection also depends on the brim. A narrow cap may shade part of the face while leaving the ears, neck and sides of the face exposed.

Choose a closely constructed, UPF-rated hat with a brim that provides useful coverage.

Can UV pass through gloves and arm sleeves?

Yes, particularly if the fabric is thin, stretched or sheer. Purpose-designed arm sleeves and sun gloves can provide a convenient barrier for areas that receive frequent incidental exposure, including during walking, cycling, driving and outdoor activities.

The fit should be secure without pulling the material excessively tight.

Can you tan through clothing?

If enough UV radiation passes through a fabric, the skin beneath it may tan or burn. A tan is a sign that the skin has responded to UV exposure; it should not be treated as evidence of healthy or harmless sun exposure.

Uneven tanning beneath clothing can also indicate that the fabric is not blocking UV consistently.

Whether visible tanning occurs depends on the amount of UV that passes through, the duration of exposure and individual skin response.

Why does a UPF rating matter?

UPF stands for Ultraviolet Protection Factor. It measures how much UVA and UVB radiation can pass through a fabric and reach the skin.

A UPF 50 fabric allows approximately one-fiftieth, or about 2%, of UV radiation to pass through under the relevant test conditions.

In simple terms:

• UPF 15 allows about 1/15th of UV through;
• UPF 30 allows about 1/30th of UV through;
• UPF 50 allows about 1/50th of UV through;
• UPF 50+ represents an excellent level of textile protection.

The rating applies to the fabric or garment under defined testing conditions. It does not mean the garment protects uncovered skin or removes the need for sunscreen, shade, a hat and sunglasses.

For a deeper explanation, read The Science of UPF 50+ Clothing and Sun Hats.

UPF is different from SPF

UPF is used for textiles. SPF is used for sunscreen.

Clothing protects the areas it covers, while sunscreen is applied to exposed skin. A complete routine uses both where appropriate.

Can you test clothing for UV protection at home?

You cannot accurately determine a UPF rating at home. Proper UPF testing requires specialised laboratory equipment and standardised test methods.

However, a few simple checks may help identify clothing that is unlikely to provide strong protection.

The light test

Hold the fabric up to a strong light source. If you can easily see light, shapes or your hand through it, the material may allow more UV through.

This is only a rough indication. It cannot replace laboratory testing, and some fabric technologies may perform differently from what appearance suggests.

The stretch test

Gently stretch the material as it would be stretched while worn. If the fabric becomes much more transparent, protection may be lower in those areas.

The condition check

Look for:

• thinning fabric;
• worn elbows or knees;
• small tears;
• loose seams;
• faded or degraded material;
• areas permanently stretched out of shape.

Replace or repurpose garments that no longer provide consistent coverage.

Does washing reduce clothing’s UV protection?

Washing can affect fabrics in different ways. Some garments may become denser after initial washing and provide equal or improved protection, while repeated wear, abrasion, fibre breakdown and thinning may reduce protection over time.

Always follow the garment’s care instructions. Excessive heat, bleach, harsh chemicals or rough handling may damage fibres, stretch and finishes.

For UPF clothing:

• wash according to the care label;
• avoid unnecessary bleach unless specifically permitted;
• do not overstretch the garment when wet;
• inspect high-friction areas regularly;
• replace garments that have become thin, damaged or permanently distorted.

How to choose clothing that protects against UV

For everyday wear

Choose comfortable long-sleeve tops, dresses and trousers that provide practical coverage without feeling heavy. A garment that looks refined and feels comfortable is more likely to become part of your daily routine.

For hot weather

Look for lightweight, breathable UPF 50+ fabrics rather than relying on sheer clothing. Loose-fitting silhouettes can support airflow without pulling the fabric tightly across the skin.

For walking and outdoor activities

Prioritise coverage, movement, moisture management and a secure fit. Pay attention to areas where clothing may ride up, including the wrists, waist and lower back.

For swimming

Choose purpose-designed UPF swimwear with enough coverage for your intended activity. Long sleeves, higher necklines and swim leggings can reduce the amount of exposed skin.

For hands and arms

Arm sleeves and sun gloves can provide targeted coverage without requiring an entirely different outfit. They can be useful for driving, walking, gardening, cycling and other daily activities.

How clothing fits into a complete sun-protection routine

Clothing is one layer of protection, not the entire routine. In Australia, sun protection is recommended when the UV Index reaches 3 or above.

A comprehensive approach includes:

1. protective clothing;
2. broad-spectrum, water-resistant SPF 50 or SPF 50+ sunscreen;
3. a broad-brim hat;
4. shade;
5. sunglasses.

Check the daily UV forecast rather than relying on temperature or cloud cover. Our guide What Does the UV Index Mean? explains how to interpret every UV level.

For a broader routine covering sunscreen, shade, clothing and daily habits, read Sun Protection Beyond Sunscreen.

Why Aurelia Sun focuses on UPF 50+ clothing

Aurelia Sun is designed around the idea that sun protection should fit naturally into a woman’s wardrobe.

Coverage is only useful when it feels comfortable, breathable and appropriate for everyday life. Our focus is on pieces that support sun-smart dressing without asking you to choose between protection and personal style.

UPF 50+ provides a measurable foundation. Thoughtful silhouettes, suitable coverage and comfortable fabrics help turn that protection into clothing you can actually wear.

Helpful external resources

For further guidance on clothing, UV protection and UPF ratings, visit these independent resources:

• Cancer Council Australia: Sun protective clothing
• ARPANSA: Australian sun protective clothing standard
• World Health Organization: Protecting against skin cancer
• World Health Organization: Ultraviolet radiation