How to try on clothes online before you buy

The default strategy for buying clothes online is to order the same thing in three sizes and send two back. It works. It is also slow, wasteful, expensive for everyone involved, and useless when the thing you are buying has a date attached to it.

There are five things you can do instead. None of them is a complete answer on its own; together they get you close enough that a single order is usually the right order.

1. Put it on your own photo with AI try-on

This is the only method that answers the question you are actually asking — what does this look like on me — rather than a proxy for it. A generative try-on produces a photograph of the specific garment on your specific body, with real fabric drape, at real proportions.

In practice it takes about a minute: add one full-length photo, which builds a reusable model of you, then pick a piece and generate. Everything after the first photo is a single tap. The details of how the generation works are genuinely interesting, but the operational summary is that the image is generated rather than pasted, which is why it holds up.

What it tells you: silhouette, proportion, where the hem lands, whether a colour works against your skin, whether a shape suits your frame. What it does not tell you: which size to order, or how a fabric feels in the hand.

2. Measure yourself once, properly

Almost nobody does this, and it takes four minutes. With a soft tape: chest or bust at the fullest point, natural waist at the narrowest, hips at the fullest, inseam from crotch to floor in bare feet, and shoulder-to-shoulder across the back. Write them in a note on your phone.

You now have the numbers that every brand's size chart is expressed in. This matters more than it sounds, because clothing sizes are not a standard — a 'medium' is a decision each brand makes independently, which is why H&M's own lines disagree with each other and why Aritzia is really five brands in a trench coat.

3. Read the garment's own measurements, not the size label

Good listings publish flat measurements for the actual piece: pit-to-pit, body length, sleeve length, rise, inseam, hem width. These are worth ten times the size chart, because they describe the object rather than the abstraction.

The cheat that makes this instant: take a garment you already own and love, lay it flat, measure it, and compare. You are no longer guessing whether a shirt is oversized — you are comparing 58cm pit-to-pit against the 54cm you already know works.

1. 01Find the piece in your wardrobe that fits the way you want the new one to fit.
2. 02Lay it flat and measure pit-to-pit and body length. Two numbers is enough for tops.
3. 03For trousers, measure the rise and the inseam instead — those are the two that decide the look.
4. 04Compare against the listing's flat measurements, not its size chart.

4. Read reviews from people built like you

Review sections are close to useless in aggregate and extremely useful filtered. Ignore the star rating. Look only for reviewers who have stated their height and usual size, and read what they say about length and shoulder fit — the two things product photography hides most reliably.

The pattern worth searching for explicitly: several reviewers of similar height all mentioning the same thing. One person saying a dress is long is noise. Four people at 5'3" saying it is long is a measurement.

5. Know the brand's habits before you order

Sizing behaviour is a brand-level property and it is remarkably stable. Uniqlo cuts to a Japanese block and runs short in the body. COS builds in room by design and rewards sizing down. The North Face is cut for a mid-layer underneath, so sizing up for the oversized look overshoots. Rigid Levi's feel a size tight on day one and then relax.

None of these are secrets. They are just rarely written down in the place you are standing when you need them.

Which method answers which question

The order that wastes the least time

Try it on yourself first, because the fastest thing you can learn is that the shape is wrong for you — and if it is, no amount of size arithmetic saves it. Only once you know you want the piece is it worth spending four minutes on the measurements to work out which number to order.

Done in that order, most of the ordering-three-sizes ritual disappears. Not because any single method is perfect, but because the two failure modes — wrong shape and wrong number — have completely different fixes, and people usually attack the second when their problem is the first.

See the shape on yourself first. The size chart is a much easier problem after that.

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