A navy crewneck is a navy crewneck. Nothing about the fleece, the ribbing or the faded print on the chest knows who it was originally sold to, and yet somewhere along the way it picked up a tag that sorts it onto one rack or the other. Anyone who shops vintage regularly learns that those tags are a suggestion. Half the good finds in a store are in the section you were not planning to look at.
The trouble is translation. Men's and women's sizing were built on different systems, using different reference bodies and different numbers, and vintage clothing adds decades of drift on top of that. This guide explains how the two systems relate, where the cuts genuinely differ, and how to shop a whole store with confidence, whichever section you usually start in.
01. Two systems that grew up separately
Men's clothing has long been sized by direct measurements. A shirt might be labelled by neck and sleeve length, trousers by waist and inseam, jackets by chest. Even when a garment uses small, medium and large, those letters usually correspond loosely to chest measurements. It is not precise, but the logic is visible.
Women's clothing went a different way. Most North American women's sizes use abstract numbers, like 6, 8 or 10, that do not refer to any single measurement. Those numbers were meant to describe an overall body shape, and the shape they describe has been redefined many times by different companies and in different decades. Letter sizes in women's clothing sit on top of that system rather than replacing it.
Because the systems never shared a foundation, there is no official chart that converts one to the other. Every conversion you see, including the ones below, is an approximation based on how clothing tends to fit rather than a rule written into the labels.
02. A rough conversion, held loosely
With that caveat clear, some broad patterns do help when you are standing in front of a rack. For tops, people often find that a men's size runs roughly one size larger than the same women's letter. A women's medium may fit like a men's small, and a women's large like a men's medium, depending on the cut. Going the other direction, a man who wears a medium may find a women's large or extra large closest, though the shoulders and length may still feel different.
For trousers, the comparison is harder because women's numbers are not waist measurements. Many women's jeans and trousers also include a curve through the hip and seat that men's cuts do not. That means a pair of men's jeans with the right waist may be tight across the hips, while a pair with the right hips may gape at the waist.
- Tops: start by trying one letter size smaller in men's than you would in women's, then adjust.
- Bottoms: ignore the number and compare the waist, hip and rise measurements to a pair you already like.
- Outerwear: look at the shoulder seam and sleeve first, since jackets have the least room for error.
- Knitwear: knits stretch and forgive, so size conversions matter less than length and sleeve.
These shortcuts get you to the right part of the rack. They do not tell you whether a garment will fit, which is why the next step matters most.
03. Measurements that cross the aisle
Measuring a garment flat is the one method that works across every section and every decade. Lay the piece on a table, smooth it out without stretching, and measure in the same way each time. Compare those numbers with a garment you already own and like the fit of, not with your body measurements, since clothing is meant to sit with some ease.
The useful measurements for tops are the chest, from armpit seam to armpit seam; the shoulder, from seam to seam across the back; the length, from the highest point of the shoulder to the hem; and the sleeve, from the shoulder seam to the cuff. For trousers, measure the waist straight across, the hip a little below the fly, the front rise from crotch seam to waistband, and the inseam.
Keep a note on your phone with the numbers from your two or three favourite pieces. It takes ten minutes once and saves hours of second-guessing. With those reference numbers, a tag that says men's medium or women's 10 becomes far less important.
The tag tells you who the garment was sold to. The tape measure tells you who it was made for, and sometimes that turns out to be you.
04. Where the cut really differs
Not all differences are about size. Men's and women's clothing are often cut to different shapes, and those shapes matter more than any number. The shoulder is the first. Men's tops typically have broader, squarer shoulders, while women's tops are often narrower with a slightly sloped line. A men's shirt on a narrower frame drops the seam down the arm, which can look intentionally relaxed or simply too big.
The chest and waist are next. Women's tops may include darts or shaping that brings the fabric in at the waist, and some have more room through the bust. Men's tops are usually straight from chest to hem. That straight cut is part of why oversized men's sweatshirts and tees look so easy on everyone; there is no shaping fighting against the body.
Trousers show the biggest difference. Women's cuts generally have a shorter distance between waist and hip and more curve through the seat, while men's cuts are straighter with a longer front rise and more room in the thigh. Neither is better. They simply suit different shapes and create different silhouettes.
The button side
One small detail can help you identify a piece's original section at a glance: on shirts and jackets, men's garments traditionally button with the buttons on the right side and women's with the buttons on the left. It does not affect fit, but it is a handy clue when a tag is missing, and some people simply prefer one way over the other once they notice it.
05. Vintage women's sizes have drifted
If you shop vintage women's clothing, there is an extra layer to consider. Women's numeric sizes have shifted significantly over the decades, generally getting more generous. A garment marked size 12 from several decades ago may fit like a much smaller modern size. This is sometimes called vanity sizing, and it means that you cannot simply look for your current number on an old tag.
Men's sizing has drifted too, though usually less dramatically. A vintage men's medium tee from the eighties is often narrower and shorter than a modern one, while a nineties large can be enormous. The cut of the decade matters as much as the size on the tag.
The practical answer is the same in both cases: measure. Think of a vintage tag as a record of how the garment was sold at the time, not as information about how it fits now.
06. Shopping the other direction
Most conversations about unisex vintage focus on women shopping the men's racks, but it works the other way too. Men who explore the women's section can find excellent pieces, particularly in knitwear, outerwear and accessories. Women's cardigans and sweaters from past decades often come in interesting colours and textures. Women's coats and jackets can have lovely details in their buttons, collars and linings.
For men, the main thing to watch is the shoulder and the length. Women's tops may feel narrow across the back and short through the body or sleeve. Larger women's sizes can work well, especially in loose knits and boxy jackets from the eighties, when women's shoulders were often padded and broad. That decade in particular produced women's blazers and coats that fit many men beautifully.
Accessories are the easiest crossover of all. Bags, scarves, belts, caps and jewellery rarely need any size conversion at all. A good vintage leather belt or a well-made bag is simply good, whoever it was originally intended for.
07. Category by category
Different garments convert with different degrees of ease. Tees and sweatshirts are the simplest. Most vintage sportswear was cut straight and boxy, so anyone can wear it; you are only choosing how oversized you want it to look. Hoodies follow the same logic, with the sleeve length being the main point to check.
Button-up shirts and jackets need more care because the shoulder seam is structural. If it sits more than a few centimetres beyond your natural shoulder, the garment will look deliberately big. That can be a good thing on a work jacket or an oversized shirt, but it is harder to pull off on tailored pieces.
Denim and trousers are the hardest crossover, as discussed above. If you love a particular cut of jeans, such as a straight-leg men's pair, measure the hip and rise carefully. A good tailor can take in a waist easily, while letting out the hips is often impossible. Knitwear is the most forgiving: stretch helps it adapt to different frames, and the main thing to watch is length.
08. A routine for the whole store
When you walk into a vintage store, try a simple routine: first decide what kind of piece you are looking for, then search every rack where it could be hiding. Looking for a crewneck? Check the men's sweats, the women's sweats and the sportswear section. Looking for a jacket? Check every outerwear rack, regardless of label. At Throwback Vault, where pieces from many decades sit near each other, that approach tends to turn up things you would otherwise miss.
Bring your reference measurements, or better, wear one of your best-fitting pieces when you shop so you can compare directly. Try things on whenever you can, paying attention to the shoulders, the length and how the garment moves when you lift your arms or sit down.
Vintage clothing has always been more flexible than its labels. The best way to use that flexibility is to treat the whole store as one big collection, sorted by garment rather than by gender, and to let fit decide what comes home with you.
