Find Your Fit: How to Get Sizing Right When You Swap Clothes Online

The number one reason an online swap disappoints isn't the piece — it's the fit. Clothing sizes are notoriously inconsistent: brands size differently, countries number differently, and vintage sizing bears almost no relation to modern labels. The same body can be three different sizes in one shopping trip.

The fix is simple and it takes about five minutes: stop trusting the label, and start trusting measurements.

Know your four numbers

Grab a soft tape measure (or a piece of string and a ruler) and write these down once — they'll serve you for every swap you ever make:

1. Bust/chest — around the fullest part, tape level, arms down.
2. Waist — the narrowest part of your torso, usually just above the belly button.
3. Hips — around the fullest part, roughly 20cm below the waist.
4. Inseam — from crotch to ankle, for trousers and jeans.

Keep them in your notes app. Now any listing with measurements is instantly answerable — no size chart required.

“The label is the brand's opinion. The tape measure is the truth.”

The best trick: compare to what you own

Even easier than measuring yourself is measuring a garment you already love. Lay your favourite jeans flat and measure the waist edge-to-edge; do the same for a top you like across the chest, and note the length. Now when someone posts a piece, you're comparing garment-to-garment — the most reliable fit check there is, because it accounts for cut and ease, not just body size.

Ask the right questions

A good swapper is happy to answer these, and asking marks you as someone who takes trades seriously: What are the flat measurements? How does it fit you, and what size are you normally? Is it oversized, true to size, or small? Has it been altered or shrunk? Two messages up front save a swap that doesn't work for either of you.

Know where fit is forgiving

Some pieces barely care about size: oversized shirts, knitwear, wrap dresses, elasticated or drawstring waists, and most outerwear all have generous room. Tailored trousers, fitted blazers, structured dresses and anything in a rigid, non-stretch fabric are where precision matters. When you're new to swapping, start with the forgiving stuff and build confidence.

And if it doesn't fit?

It's not a disaster — it's a swap. That's the quiet advantage of a circular closet over buying: a piece that isn't right for you goes straight back into rotation for someone it will suit, instead of hanging in your wardrobe as a £60 mistake. On Bestis, listings show sizes and real photos up front, so you can check the fit before you trade — and pass anything on easily if it isn't the one.