Joybuy Insights

Buying T-shirts online: how to choose a style that suits you and your needs

Buying a T-shirt online seems straightforward, until you have to choose between dozens of materials, fits, colours and size charts. A men’s T-shirt for everyday wear requires something different from a sports T-shirt for tennis. An oversized T-shirt can also fit quite differently in practice from what its name suggests.

If you focus only on colour or an appealing product photo, you are more likely to be disappointed. The fabric may feel too warm, the fit may come up smaller than expected, or the print may not work with the rest of your wardrobe. Use the following checkpoints to compare a cotton T-shirt, polyester T-shirt, casual T-shirt or streetwear T-shirt more effectively.

Common pitfalls when buying T-shirts online

1. A generous name does not always mean a generous fit

Terms such as oversized, relaxed fit and loose fit are not used consistently everywhere. Always check the chest measurement and length in centimetres. A style may be broad across the shoulders but still come up relatively short. With plus-size T-shirts, the size chart is particularly important, as sizing varies between brands and collections.

2. “Breathable” means little without material information

A breathable T-shirt may be made from either cotton or polyester. Cotton often feels soft and comfortable for everyday wear, while polyester is commonly chosen for sportswear because it is lightweight and has moisture-management properties. So do not just look for words such as “comfortable” or “fresh”; check the fibre composition and fabric weight.

For products that mention moisture management or moisture wicking, this information comes from the product description or a brand claim. According to K-Swiss product information, the Hypercourt range is designed with moisture-management technology; this is not a universal guarantee that every wearer will have the same experience.

3. A striking colour can be harder to style

A green T-shirt, bottle-green style or petrol-green T-shirt can add more colour to an outfit, but pay attention to the undertone. Petrol green usually works well with navy, black, grey and denim. Olive and bottle green pair nicely with beige, ecru, brown and neutral trainers. Also check whether the product photo shows the colour under neutral lighting; screen settings can affect the shade.

Important specifications to check

Material: cotton, polyester or a blend

100% cotton is a sensible choice for a casual T-shirt, everyday wear and layering over a shirt or under a jacket. Pay attention to the fabric weight. A jersey of around 160 g/m² will generally feel lighter than a heavyweight version weighing 180 or 240 g/m². A heavier fabric can provide more structure, but it is not automatically better suited to warm days.

Polyester is widely used for sports and outdoor T-shirts. The material is lightweight and generally dries faster than cotton. This can be practical for tennis, training or intense physical activity. However, check the care instructions and information about the finish. A product description may mention moisture management, but the actual wearing experience also depends on temperature, exertion and fit.

Fit and measurements

Choose a classic, relaxed or oversized fit based on how you plan to wear it:

  • Classic fit: suitable under a shirt, cardigan or jacket.
  • Relaxed fit: provides extra room without making the shirt extremely wide.
  • Oversized T-shirt: often has wider shoulders and a longer or roomier body; useful for a streetwear look or layering.

If you are unsure, measure a T-shirt you already find comfortable. Compare the chest width, total length and shoulder width with the online size chart. For a style described as “oversized”, it is best not to automatically size up.

Neckline, print and care

A crew neck is versatile and works with sporty and casual outfits. A printed T-shirt attracts more attention, so choose a print that complements your trainers, trousers or jacket. Check whether the shirt should be washed at 30 or 40 degrees, whether it can go in the tumble dryer and whether the print should be ironed inside out.

The recommended washing instructions are important not only for the garment’s lifespan. They also help minimise shrinkage, fading and distortion. Always follow the care label for the specific product.

Recommended T-shirts by user type

Suitable for: Budget-conscious beginners
Ladies Extended Shoulder Tee Olive XS

Ladies Extended Shoulder Tee Olive XS

Why it suits this profile: This women’s T-shirt has a relaxed shoulder line and an olive-green colour that is easy to style with jeans, neutral trousers or a jacket.

How this product avoids the pitfall

The product information states that it is made from 100% cotton and has a relaxed design. Before buying, check that size XS matches your measurements.

Key benefit & advantages

100% cotton, short sleeves and a drop-shoulder design with turned-up sleeve details.

Suitable for: Shoppers seeking premium quality
THE North Face Men T-Shirts NF0A8E3H New Taupe Green/TNF Bla M

THE North Face Men T-Shirts NF0A8E3H New Taupe Green/TNF Bla M

Why it suits this profile: A men’s relaxed-fit T-shirt for everyday wear, travel and light outdoor activities. The taupe-green shade is subtler than bright green.

How this product avoids the pitfall

The product details list both the material and the chest measurement for each size. This allows you to check the fit instead of relying solely on the brand label.

Key benefit & advantages

100% cotton, 160 g/m² and a water-based graphic print on the back, according to the product description.

Suitable for: Specific uses & intensive users
K-Swiss Kswiss Hypercourt Print Crew 5 Petrol Green Pink T-Shirt XL

K-Swiss Kswiss Hypercourt Print Crew 5 Petrol Green Pink T-Shirt XL

Why it suits this profile: This sports T-shirt is designed for tennis and training, but its petrol-green colour and print also make it a sporty casual option.

How this product avoids the pitfall

The product information states that it is made from polyester, has a crew neck and uses lightweight fabric. According to K-Swiss’s own information, the technology supports moisture management; check whether this suits the way you plan to use it.

Key benefit & advantages

Lightweight polyester, a crew neck and a printed design; available in XL. A size M version is also in the range.

More room for a streetwear look

If you are looking for an oversized T-shirt, consider the Heavy Oversized Tee in bottle green. According to the product information, this style is made from 100% cotton jersey and is available from S to 5XL. Versions with a fabric weight of 180 g/m² and 240 g/m² are available. The heavier version creates a more distinctly structured look.

Pay close attention to the size chart: the product information describes an oversized style, but also mentions a classic or close-fitting cut in the sizing advice. Therefore, use the stated chest and length measurements as your starting point. The bottle-green colour works well in a pared-back streetwear T-shirt outfit with cargo trousers, denim or shorts.

Looking for more options?

We have put together a complete, up-to-date list of products that fully meet these strict selection criteria and the applicable European safety regulations.

Frequently asked questions about buying T-shirts online

How do I determine my size when buying a T-shirt online?

Lay a well-fitting T-shirt flat on a table and compare its chest width and length with the product’s size chart. Also check the fit description. A relaxed or oversized style may fit more generously in the same size than a traditionally cut T-shirt.

Is cotton or polyester better for a T-shirt?

For everyday wear, many people choose cotton because jersey feels soft and breathable. For tennis, training or other intensive activities, polyester can be practical thanks to its lightweight construction and stated moisture-management properties. Always check the specific product composition and care instructions.

How can I make a T-shirt last longer?

Wash it according to the label, use similar colours and avoid bleach unless permitted. Ideally, air-dry a cotton T-shirt if this is recommended in the product information. Iron prints and dark colours inside out and use a low temperature.