How to choose a T-shirt: fit, fabric and what's worth paying for

Finding one online is harder than it should be. “Premium cotton” tells you little about the cut. “Heavyweight” doesn't tell you whether you'll enjoy wearing it. And a familiar size on the label can mean something different at the next brand.

This guide explains what to look for, with examples you can compare. Start with the fit you want, choose a fabric that suits it, then decide which details deserve your money.

Already know what you like? Explore Disco's best T-shirts for men.

Start with how you'll wear it

Before comparing brands, decide what the shirt needs to do.

These are starting points. You can like a heavy tee in summer or a slim tee with wide trousers. The useful question is whether the product matches the look and feel you want.

Choose your cut

Fit names describe a brand's intention. Measurements help you understand what will arrive. Two brands can both call a shirt “relaxed” and cut it differently, and the same label can change between a brand's own models.

It helps to separate what the names describe. Slim, regular and relaxed mainly describe room through the torso and sleeves. Boxy and oversized describe broader proportions — width in relation to length — while cropped tells you specifically about length. A shirt can be relaxed without being boxy, and oversized without being cropped.

Four dimensions do most of the work: where the shoulder seam sits, how wide the chest is, how the sleeve is shaped, and how long the body is. The outlines below are drawn to one scale and aligned at the shoulder, so the width and the hem both move where the pattern moves them.

Boxy versus oversized

These two words get used as if they mean the same thing, and they do overlap. A boxy tee can be wide and short. An oversized tee can be wide and long. A shirt can also be both boxy and oversized.

The distinction matters when you are shopping by photograph. A model shot can make a short, wide tee and a long, wide tee look similar, and the product name rarely resolves it. The measurements do.

Look at width and length together. Both shirts below are a medium. 1.5″ separates them across the chest and 1″ down the body, in opposite directions — same letter on the label, a different shirt on you.

How should a T-shirt fit?

Try it with the trousers you expect to wear most. Look at where the hem lands, how the sleeves sit, and whether the shoulder placement looks intentional to you. Reach forward and raise your arms: check for restriction and whether you are comfortable with how far the hem moves.

Dropped shoulders and long sleeves can be deliberate design choices. They are not, by themselves, evidence that you bought the wrong size.

How to measure a T-shirt and choose your size

Your most useful reference is often a T-shirt you already like wearing.

1. Choose a washed tee that fits you well. Lay it flat without stretching it. Smooth obvious folds.
2. Measure the chest width. Measure across the body near the underarms. Match the exact measuring position shown by the brand you're comparing with.
3. Measure the body length. Check where the retailer starts its measurement: the highest shoulder point and the centre-back neck are different starting points.
4. Measure shoulders and sleeves if those matter to your fit. Follow the retailer's diagram. A sleeve measured from the shoulder seam is not comparable with one measured from the centre of the neck.
5. Compare the exact product's chart. Check units, colour or model variations, measurement tolerances and any stated shrinkage allowance.

Pit-to-pit versus chest circumference

A flat width of 21″ is roughly 42″ around the garment. It is not a recommendation for someone with a 42″ body chest: the space between body and garment affects fit, and fabrics stretch differently.

First establish whether a chart describes your body or the finished shirt. Comparing one directly with the other is a common source of sizing mistakes.

The decision might also be about length rather than size. If a shirt fits your shoulders but hangs too low, a shorter length option may solve the problem more directly than going down a size.

Choose your material

The composition label tells you which fibres are present. It does not tell the whole story of the fabric. Yarn, knit structure and finishing all change how a jersey feels and behaves, and none of them appear in a percentage.

That is why two shirts can share a label and wear nothing alike. Read the fibre as the starting point, then look for what the brand says about the knit and the finish — and for the measurements that tell you how much of that fabric you are getting.

Cotton is a useful starting point for a casual tee. But two all-cotton shirts can have different yarns, knitting, finishing and proportions. Choose the finished product, not just the fibre name.

Cotton/polyester blends are worth considering when easy care and shape retention matter. They can offer a different balance of softness, drape and wash behaviour from all-cotton tees. A blend is not automatically a budget compromise, and it still needs a good pattern and construction.

Modal and lyocell are regenerated cellulose fibres, often used when a softer, more fluid fabric is the goal. Check the full blend and the care label: a fibre description does not establish how the finished tee will hold its shape.

Elastane (also called spandex) adds stretch to a blend. Look at the percentage and decide whether you want that stretch or prefer the feel of a non-stretch cotton jersey.

Terms such as “organic,” “Supima,” “slub” and “loopwheel” describe different things: sourcing, cotton identity, texture or production method. None is a complete rating of the finished shirt.

What GSM means — and how much weight you need

GSM means grams per square metre: the weight of a given area of fabric. It is not the weight of the entire T-shirt, and it is not a quality score. It is one of the few numbers a brand can publish that tells you something real about how a shirt will feel.

What it is useful for is expectation-setting. A lighter jersey drapes closer to the body and layers more easily; a heavier one holds its own shape and hangs away from you. Where that lands for you depends on how you wear tees, not on which number is bigger.

US brands often state weight in ounces per square yard instead; multiply by about 34 for GSM. For browsing, we suggest these approximate groupings. They are editorial bands, not an industry standard.

Weight does not guarantee opacity, softness, breathability or longevity. Knit structure, colour and finishing also matter. Ask for a fabric weight when it would change your decision; do not infer it from price or a studio photograph.

An instructive comparison is Asket's own pair. Its T-Shirt is 180 GSM organic cotton at $65; its Lightweight T-Shirt is 120 GSM extra-long-staple Supima cotton at $95. The lighter shirt costs more while weighing less per square metre. Prices read from Asket's US site on September 17, 2026; local prices and taxes may differ.

What actually affects durability

Durability has several meanings, and they fail in different ways. A tee might resist holes but develop pills. Another might stay smooth but become too short after washing. A third might survive both and lose its collar.

So “which fabric lasts longest” is the wrong question to start with. The useful version is: which kind of failure would stop you wearing this shirt, and does anything published about this product speak to it?

For a useful comparison, consider abrasion, pilling, seam integrity and whether the dimensions remain suitable after the care routine you actually use. A fibre label alone cannot supply those test results.

This is a buying comparison, not a lab-tested lifespan ranking. We have not tested these fabric groups against one another.

When reading owner reports, look for the exact model, length of ownership and washing routine. “Still looks good after a year of weekly wear” is more informative than “feels premium” on delivery. A single report can suggest a question to investigate; it cannot establish how often a fault occurs.