Sister Jane Size Guide
Sister Jane uses letter sizes XS, S, M, M+, L, L+ and XL with UK, EU, Italian, US and Japanese equivalents – an M is a UK 10 / EU 38 / US 6. The brand recently expanded its range, so some labels may still show the old sizing (old L = new M+ / UK 12, old XL = new L / UK 14); go by the UK number.
Size conversion
| Size | UK | EU | IT | US | JP | Old size |
|---|---|---|---|---|---|---|
| XS | 6 | 34 | 38 | 2 | 5 | XS |
| S | 8 | 36 | 40 | 4 | 7 | S |
| M | 10 | 38 | 42 | 6 | 9 | M |
| M+ | 12 | 40 | 44 | 8 | 11 | L |
| L | 14 | 42 | 46 | 10 | 13 | XL |
| L+ | 16 | 44 | 48 | 12 | 15 | – |
| XL | 18 | 46 | 50 | 14 | 17 | – |
Body measurements (cm)
| Size | Bust | Waist | Hips |
|---|---|---|---|
| XS | 75–80 | 58–63 | 83–88 |
| S | 80–85 | 63–68 | 88–93 |
| M | 85–90 | 68–73 | 93–98 |
| M+ | 90–95 | 73–78 | 98–103 |
| L | 95–100 | 78–83 | 103–108 |
| L+ | 100–105 | 83–88 | 108–113 |
| XL | 105–110 | 88–93 | 113–118 |
Dress lengths: mini 83–85 cm, midi 115–134 cm, maxi 135–145 cm.
How to measure
- Bust: measure under your arms at the fullest part of your bust. Keep the tape level across your shoulder blades.
- Natural waist: measure around your natural waistline, keeping the tape comfortably loose.
- Hips: stand with your feet together and measure around the fullest part of your hips.
Fit
Sister Jane: garment sizes are based on body measurements but come in various styles, some loose fitting and some more body conscious – refer to the individual product description for style information. Each product page also shows a runs small / true to size / runs large scale.
Model
The brand states model height and size on its product pages – for example, 5’9” wearing a size S (UK 8).
Source: Sister Jane’s official size guide, checked 20 October 2026. Sizes can vary by style – if you’re between sizes, email info@willow.ie and we’ll measure the garment for you.
