Vanity Sizing

What vanity sizing is

Vanity sizing is the practice of assigning smaller size numbers to the same body measurements over time, so a shopper feels they fit a smaller size than they once did. It works because a clothing size in the US describes the body, not the garment, and no numbering has been mandatory for decades, so a brand is free to move its labels. The effect compounds: each brand nudges its numbers down to flatter its customers, and the scale drifts as a whole.

The US standard that was abandoned

American women's sizes began as a government standard. CS 215-58, published by the Department of Commerce in 1958, set body measurements for each size from a 1940s survey. It was voluntary, and in 1983 the government withdrew it entirely, leaving no official reference. The industry standard that replaced it, ASTM D5585, is also voluntary, and most brands do not follow it. With no binding scale, the numbers were free to drift, and they did.

A size 8 gained about five inches

The clearest measure of the drift is a single size tracked across the standards. In CS 215-58 in 1958 a women's size 8 was a bust of about 31 inches, a waist of 23.5 and a hip of 32.5. In the ASTM D5585 tables from the 2011 edition a size 8 is a bust of about 36 inches and a waist of 29.5, and by the 2008 revision the label had grown five to six inches in every one of bust, waist and hip. That puts a modern size 8 close to a 14 or a 16 on the old 1958 scale, without any one body changing.

The Sears drift, decade by decade

The Sears catalogues make the same point over a longer span, holding the body fixed and watching the number fall. A 32-inch bust was a size 14 in 1937, a size 8 in 1967, and a size 0 in 2011. Seven full sizes evaporated from one body in seventy-four years. The size 0, and later 00, exists only because the scale drifted so far that the original small sizes had to be renumbered below zero to make room.

It happens to men too

Vanity sizing is usually told as a women's story, but men's trousers do the same thing, hidden by a number that looks like a measurement. Menswear waists are printed in inches, so a "36" should be 36 inches. In 2010 a writer measured nominal 36-inch dress trousers across US retailers and found the real waist ran from 37 to 41 inches, a gap of up to five inches under an identical label. The inch number on men's trousers is a size, not a tape reading.

Part of the shift is real body change

Not all of the drift is marketing. Populations have genuinely grown, and two national body surveys measured by how much, which matters because it separates real change from relabelling. The Size UK survey of 2001 to 2002, Britain's first national measurement since 1951, found the average woman's height, bust and hips had each risen about 1.5 inches, while the waist had grown about 6.5 inches. Germany's SizeGERMANY survey, run by the Hohenstein Institute and Human Solutions, which scanned 13,362 people in 2007 and 2008, put numbers on the same pattern. Against the 1994 averages, German women had gained 4.1 cm at the waist, 2.3 cm at the bust, 1.8 cm at the hip and 1.0 cm in height, the waist growing close to double the bust and four times the height. Real bodies grew, most at the waist, so old size charts fit tight there for honest reasons, and vanity sizing sits on top of that real change, moving the labels further than the bodies moved.

Why European and metric sizes resist it

Vanity sizing is largely an American and British problem, and the reason is how the scales are built. The European system under EN 13402 designates sizes by body measurements in centimetres, so a size tied to an 88 cm bust cannot quietly become a 92 cm bust without changing the number, which anchors the scale to the body. Metric systems that name the measurement directly, such as a centimetre bust or a millimetre foot length, leave no room for a flattering number because the number is the measurement. US women's numbers, by contrast, are arbitrary labels detached from any dimension, which is exactly the space vanity sizing grows in. This is why a centimetre chart from a European brand drifts far less than a US numeric size, and why matching your body measurement to a centimetre chart sidesteps the problem entirely.

How to shop when the number lies

Because the number drifts and the body does not, the reliable approach is to ignore the label and work from measurements. Take your bust or chest, waist and hip in centimetres, and match them to a brand's centimetre size chart rather than to a remembered size. When a brand gives only a letter or a numeric size, treat it as that brand's alone, since a size 8 or a medium means different measurements at every label. The centimetre reading is the constant; convert it to a size with the women's and men's charts, which work from body measurements rather than a drifting number. The body-measurement guide shows how to take the readings.

Frequently asked questions

Why do I fit a smaller size than I used to?

The labels moved, not necessarily your body. A size 8 has gained about five inches of bust since 1958, so the same measurement now carries a smaller number.

Is vanity sizing why size 0 exists?

Yes. The scale drifted so far toward smaller numbers that the original small sizes were renumbered below zero, creating 0 and then 00.

Does vanity sizing affect men?

Yes. Men's trouser waists are printed in inches but do not match: nominal 36-inch trousers have measured 37 to 41 inches across brands.

Did people get bigger, or is it all relabelling?

Both. National surveys found real growth, most of all at the waist, but the labels moved further than the measurements did, which is vanity sizing on top of real change.

How do I find my real size?

Measure bust or chest, waist and hip in centimetres and match a brand's centimetre chart. Ignore the remembered number, since it means something different at every label.