Ralph Lauren Size Chart
US heritage · women's
Ralph Lauren women's apparel uses US numeric sizing from 0 to 18, with a letter mapping where a 4–6 is Small, 8–10 is Medium and 12–14 is Large. The brand publishes its chart in inches, so the centimetre figures here are converted: a US 8 (Medium) fits roughly a 90cm bust, 72.5cm waist and 98cm hip. The key conversion to remember is that Australian sizing runs four numbers above US sizing, so a US 8 equals an AU 12 and a UK 12. Ralph Lauren's Lauren diffusion line, the one most common in department stores and secondhand, is cut with a little more ease than the designer Collection range, and the brand advises sizing down one if you are between sizes and want a closer fit. Tailored shirts and outerwear are drafted to layer. When buying Ralph Lauren secondhand, confirm whether a piece is the Lauren or the Collection line, since the same US number fits slightly differently between them.
Ralph Lauren women's uses US numeric sizing (0–18) with an XS–XL letter mapping. The brand publishes in inches; centimetres below are converted.
Ralph Lauren body measurements
| Size | Letter | Bust (cm) | Waist (cm) | Hip (cm) |
|---|---|---|---|---|
| 0 | XS | 80 | 62 | 87.5 |
| 2 | XS | 82.5 | 65 | 90 |
| 4 | S | 85 | 67.5 | 92.5 |
| 6 | S | 87.5 | 70 | 95.5 |
| 8 | M | 90 | 72.5 | 98 |
| 10 | M | 92.5 | 75 | 100.5 |
| 12 | L | 96.5 | 78.5 | 104 |
| 14 | L | 101.5 | 84 | 106.5 |
| 16 | XL | 106.5 | 89 | 111.5 |
Note: Ralph Lauren publishes its size chart in inches. The centimetre values above are converted from Ralph Lauren's official figures.
Note: we could not fully confirm this chart against a standalone official source. Measure the garment flat before buying.
Ralph Lauren international size conversion
| AU | US | UK | EU |
|---|---|---|---|
| 4 | 0 | 4 | 32 |
| 6 | 2 | 6 | 34 |
| 8 | 4 | 8 | 36 |
| 10 | 6 | 10 | 38 |
| 12 | 8 | 12 | 40 |
| 14 | 10 | 14 | 42 |
| 16 | 12 | 16 | 44 |
How Ralph Lauren fits
Ralph Lauren's Lauren diffusion line is cut with a little more ease than the designer Collection range, and the brand advises sizing down one if between sizes. Tailored shirts and outerwear are drafted to layer.
Ralph Lauren sizing — frequently asked questions
What is a Ralph Lauren US 8 in Australian sizing?
Australian sizing runs four numbers above US sizing for Ralph Lauren, so a US 8 equals an AU 12 and a UK 12 (EU 40). A US 8 Medium fits roughly a 90cm bust, 72.5cm waist and 98cm hip, converted from the brand's inch chart.
Does Ralph Lauren run big or small?
The Lauren diffusion line, the most common in department stores and secondhand, is cut with slightly more ease, and Ralph Lauren advises sizing down one if you are between sizes and want a closer fit. The designer Collection range runs a touch trimmer than Lauren at the same number.
How do I size Ralph Lauren when buying secondhand?
Confirm whether a piece is the Lauren or the Collection line, since the same US number fits slightly differently between them, then match the centimetre measurements above. Remember the AU number is four above the US tag, so a tagged US 8 wears like an AU 12.
How to measure Ralph Lauren against your own wardrobe
The most reliable way to check fit is to compare Ralph Lauren's chart above to an item you already own. Lay it flat and measure in centimetres — see the full how-to-measure guide for step-by-step instructions.
Found your size? Shop Ralph Lauren secondhand on Bushpop.
Browse the shop →Last verified: June 2026. Sources: size-charts.com, sizecharter.com.