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THE REFERENCE SHELF

Size charts

A size chart is only useful if you know which system it speaks. These charts explain the system first — neck-and-sleeve, letter sizes, numeric sizes, international codes — and then give you the grid.

Last verified: 26 August 2026

Different corners of the clothing industry sized garments in different decades, for different bodies, with different amounts of honesty — which is why the same person can be a 15½/33, an M, a 40, and a 42 depending on the rack. Each chart below decodes one of those systems and shows the grid in inches and centimeters. Where ShirtMath holds published manufacturer specifications, the chart shows real per-garment numbers and says exactly where they came from; where a chart is industry-standard reference, it says that instead. The difference matters — the methodology page explains why.

Every chart, and the system it decodes

Men's dress shirt sizesNeck × sleeve, decoded — what 16 34/35 actually means, the full grid, and slim vs classic vs athletic cuts.THE TWO-NUMBER SYSTEM T-shirt sizesPublished chest and length specs for eight real styles, size by size — including the 3-inch gap hiding inside one letter.PUBLISHED SPECS, SIDE BY SIDE Women's clothing sizesNumeric-to-letter conversion, the bust/waist/hip grid, and why women's sizing standardized less than men's.NUMBERS ↔ LETTERS International conversionUS, EU, UK and Italian clothing sizes cross-referenced — what a 38 or a 42 means on each continent.US ↔ EU ↔ UK ↔ IT

Charts tell you what the industry intends. If you'd rather work from the shirt itself, the guides show you how to measure one, and the tools turn that measurement into a size. The deeper story of why the letter on the label drifted from the tape lives at vanity sizing.

More in this section

Dress size chart: how to read one and measure a dressA dress size chart is one brand's private table linking a size label to bust, waist and hip. Jacket Size Chart for Men: What 38, 40 and 42 MeanA men's jacket size names a body chest in inches: a 40 is drafted for a 40 inch chest, not a 40 inch garment. Men's Pants Size Chart: What W x L Actually MeasuresA men's pants size chart maps a two-number label onto inches: waist first, inseam second. Shoe width chart: what B, D, 2E and 4E actually meanA shoe width letter is a relative grade, not a fixed measurement. Shoe size chart: US, UK, EU and CM conversions comparedA US men's 9 is a UK 8, roughly an EU 42.5, and a foot about 27.0 cm long.

Charts describe averages. Your shirt is not an average. Scan a shirt you own and search by its actual measurements instead.

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