Why fit matters more than material

Short answer: A perfect material in the wrong size is uncomfortable all day, no matter how good its other qualities are. A proper fit in an ordinary material is not. That is why fit, not fibre, is usually what decides whether a piece of clothing gets worn or set aside.

Wrong size is felt constantly

If a piece digs in or folds, you feel it with every movement, wherever you are and whatever you are doing. The material does not change that, since even the softest fibre cannot fix a waistband that cuts in or a sleeve that is too short. See bamboo underwear for men.

Material is felt more indirectly

The benefits of the material show over hours, as dryness, temperature and how soft the fabric feels against the skin through the day. Fit, by contrast, is felt instantly and every time you move, sit down or reach your arms up. That is why fit usually decides whether a piece gets worn again.

Measure instead of guessing

Measure a piece that already fits well, and compare the centimetres against the size chart instead of guessing from your usual size. It takes a few minutes and avoids the most common mistake, assuming the same letter size falls the same way from brand to brand. See guide to briefs and underpants.

Try the cut before ordering more

If you are unsure about a new cut, try it in one size rather than ordering the same cut in two sizes and keeping the better one. That gives a more reliable impression than comparing two sizes of something whose shape you do not know yet anyway. See bamboo briefs.

Shrinking changes the fit

A piece that shrinks moves almost half a size after only a few washes, even when cared for as instructed. That turns a fit that felt perfect at purchase into something too tight a few months later, which is why it is worth knowing the shrink rate before choosing a size. Read washing and care.

Different body shapes, same size

Two people with the same chest or waist measurement can experience a garment quite differently, because body shape, not just measurement, decides how the fabric falls. That is one reason reviews from other customers rarely replace trying it on or measuring against your own clothes.

The cut can shift between seasons

Even within the same brand, the cut of a piece can change from season to season without the size label changing with it. What you used to take in a certain size can therefore fall differently in a newer collection, another reason to measure rather than go by habit.

What to do when nothing quite fits

If nothing you normally take fits, that can be a sign the cut of that brand does not match your body shape, regardless of size. In that case it is often quicker to try a different cut than to keep ordering more sizes of the same one.

Fit over trends

Do not follow a cut trend if it goes against what you know works on your body. A looser or tighter cut can look right in a photo, but it is daily comfort, not how it looks on an image, that decides whether the piece ends up being worn.