Take a tee, a knit and a coat. Wear them together and three hems appear at three heights. Most people never choose those heights; they are simply wherever the clothes happen to end. That is why the same three pieces can look planned on one day and accidental on the next.

Why almost-matching hems look like a mistake

The eye reads a hem as a horizontal line. Two lines that sit very close together look like one line that went wrong: a shirt that rode up, a jumper that shrank. Two lines that sit clearly apart look like a decision. The distance between them matters more than the lengths themselves.

This is a rule of thumb from styling practice, not a measured law, and the numbers below are a starting point you can test on your own clothes in a mirror.

Try your own layers

Switch layers on and off, then drag the red dots (or use the sliders) to set where each hem ends, in centimetres below your natural waist, the narrowest part of your middle. Measure a real tee, knit and coat from the waist seam down if you want a true read.

Hems are measured downward from the natural waist. Each layer sits slightly wider than the one beneath it, so a longer inner layer shows below a shorter outer one.

The gap guide

Gap between hemsWhat it usually reads as
Under 3 cmAccidental: one layer looks like it slipped
3–8 cmDeliberate, a quiet peek of the layer below
9–15 cmBold, easy to see from across a room
Over 15 cmTwo separate shapes rather than one layered outfit

Even steps or uneven?

Two gaps of exactly the same size look tidy and a little formal, like a staircase. Gaps that differ by a few centimetres feel looser and more relaxed. Neither is wrong; choose by mood. A tailored coat over a fine knit suits even steps. A big cardigan over a tee suits uneven ones.

Choose the gap, not the length: the space between two hems says whether it was planned.

How to adjust what you already own

You rarely need new clothes to fix a hem clash. Three small changes cover most cases.

When to break the rule

Matching hems on purpose also works, as long as they truly match. A knit and a shirt cut to the same length can look like one piece, which is a valid look. Long coats are another exception: when the coat covers everything beneath it, the inner hems no longer show and only the coat's hem matters. And a heavily textured knit can hide a small gap, so check by eye rather than by tape alone.

Fabric changes the read too. A thin cotton tee under a thick wool knit drapes differently, so measure when the clothes are worn, not flat on a bed.