How to Tell If Clothes Will Fit Before You Buy Online

Stop shopping by size label

A size label is not a measurement, it is a marketing decision. The same body wears a medium at one brand and a large at another, and both are correct as far as the brand is concerned. Any method that starts with your usual size inherits that noise before it begins.

The method below starts somewhere more stable — your actual measurements — and treats the size label as the last step rather than the first.

Measure yourself once, properly

This takes five minutes and you will use it for years. Use a soft tape, wear thin clothing, and do not hold your breath or pull tight.

• Chest or bust — around the fullest part, tape level all the way round.
• Waist — at the narrowest point, usually just above the navel, not where your trousers sit.
• Hips — around the fullest part, generally about eight inches below the waist.
• Inseam — from the crotch to where you want a trouser leg to end, measured on trousers you already like.
• Shoulder width — seam to seam across the back of a jacket that fits you well.
• Your height, which matters more than anything for length.

Read the size chart, not the size

Once you have numbers, a size chart becomes useful rather than decorative. Find your measurement in the chart and take the size it points to, even when that size is not the one you think you are.

Two things to watch for. First, whether the chart lists body measurements or garment measurements — these are different, and a chart of garment measurements already includes ease. If a shirt chest reads four inches larger than yours, that is normal for a relaxed fit and tight for a tailored one.

Second, when you fall between sizes, let the garment decide. Size up for structured pieces — jackets, shirts, anything tailored — because you can take it in and cannot let it out. Size down for anything with stretch, which will give.

Read the listing for fit clues

Listings tell you more about fit than most people extract from them.

• Model height and size, when stated. A dress that is midi on someone 5'10" is longer on most people, and this single line resolves more uncertainty than any other.
• Fabric composition. Anything with elastane gives; pure cotton, linen and rigid denim do not. This decides whether to size up or down when you are between sizes.
• The words used. "Relaxed", "oversized" and "boxy" mean added ease. "Slim", "tailored" and "fitted" mean less. They are vague, but directional.
• Reviews mentioning length and colour specifically. Reviewers are unreliable about quality and quite reliable about whether something ran short.

Check the thing a size chart cannot tell you

Measurements settle whether a garment will close. They do not settle whether it will suit you, and that is a different question people conflate constantly.

Length is the main one. A size chart rarely gives you a hem length, and when it does, it gives it for one size on one sample. Where a dress or a coat actually falls on your legs depends on your height, and it is the most common reason something fits and still gets returned.

Proportion is the other. A cut that is balanced on a tall frame can overwhelm a shorter one at exactly the same measurements, and no chart encodes that.

This is the gap a virtual try-on closes: it puts the garment on your body at your height, which answers length and proportion directly rather than by inference.

A checklist worth using

Before you order anything, four questions.

• Do my measurements match the chart, and is the chart body or garment measurements?
• Does the fabric stretch, and does that push me up or down a size?
• How tall is the model, and how does that change the length for me?
• Have I seen it on a body like mine — a review photo, or a try-on on my own photo?