How to Know if a Vintage Piece Will Fit You Before Buying

One of the biggest hesitations new vintage shoppers have is simple: how do you know something will fit when you can't try it on first? The good news is that once you understand how vintage sizing actually works, buying online becomes far less of a gamble.

Why Vintage Sizes Don't Match Modern Sizes

Clothing sizing has crept smaller and smaller over the decades, a phenomenon often called vanity sizing. That means a size tag from 50 or 60 years ago corresponds to a noticeably smaller body measurement than the same number today. As a rough guide, a dress from the 1950s or 60s often runs about six sizes smaller than an equivalent modern size, a 1970s piece tends to run around four sizes smaller, and 1980s-90s pieces are usually only one to two sizes off from today's sizing. These are rough patterns, not fixed rules, since sizing also varied by brand at the time, but they're a useful starting point for setting expectations before you even look at measurements.

The Golden Rule: Go by Measurements, Not the Tag

Because the number on the tag is so unreliable across eras, the single most important habit to build is checking actual garment measurements rather than trusting the labeled size. A reputable seller should list key measurements for every piece, and treating that as the real "size" rather than the tag is what actually prevents disappointment.

How to Take Your Own Measurements

Knowing your own numbers makes shopping online dramatically easier. For most tops and dresses, you'll want your bust (the fullest part, measured with a bra on), your natural waist (the smallest part, roughly an inch above the belly button), and your hips (the fullest part, feet together). It's worth adding a little extra to these if you prefer a more relaxed fit, some people add an inch at the bust for comfort while keeping the waist closer to exact for a fitted look.

Not all garment types are equally straightforward to measure or fit, though. Knitwear behaves differently than woven fabric and can stretch to fit a range of bodies, coats are typically cut looser to allow for layering underneath, and pants and swimwear tend to be the trickiest categories to get right from measurements alone, so it's worth requesting extra detail (like rise and inseam) on those specifically.

Compare Against Something You Already Own

One of the most reliable ways to judge fit is to lay a well-fitting piece you already own flat and compare its measurements directly to the vintage piece you're considering, ideally something similar in style and structure. This tends to be more accurate than comparing to a general size chart, since it accounts for how you actually like your clothes to fit rather than a generic standard.

What to Ask the Seller

If measurements aren't listed, or you want more confidence before buying, don't hesitate to ask directly for garment measurements, or for details like the rise on pants or the shoulder width on a jacket. A good seller will happily provide this, and hesitation to answer specific measurement questions is worth taking as a small warning sign.

When It's Close but Not Perfect

Even with careful measuring, vintage pieces sometimes need a small adjustment, and that's completely normal. Simple alterations like taking in a waist, shortening a hem, or adjusting sleeves are usually inexpensive and can turn a nearly-right fit into a perfect one. Since quality vintage is often already a better value than buying new at the same quality level, factoring in a small tailoring cost is usually still worth it.

Shop With Confidence, Not Guesswork

Once you know your own measurements and treat the tag size as background noise rather than gospel, buying vintage online stops feeling like a gamble. At Anemoia Vestiaire, where a measurement matters for fit and isn’t in the listing, ask us — we’re glad to help you check before you buy.