Sizing varies slightly by style and fabric, so check the specific product page for measurements if you're between two sizes. These charts are a starting point, not a guarantee, since a stretch knit and a woven cotton fit differently at the same labeled size.
Tops, Dresses, and Outerwear (Standard Sizing)
| US | UK | EU | Bust (in) | Waist (in) | Hip (in) |
|---|---|---|---|---|---|
| ---- | ---- | ---- | ----------- | ------------ | ---------- |
| S | 8 | 36 | 33-34 | 25-26 | 35-36 |
| M | 10 | 38 | 35-36 | 27-28 | 37-38 |
| L | 12 | 40 | 37-39 | 29-31 | 39-41 |
| XL | 14 | 42 | 40-42 | 32-34 | 42-44 |
Tops, Dresses, and Outerwear (Numeric Sizing)
| US | UK | EU | Bust (in) | Waist (in) | Hip (in) |
|---|---|---|---|---|---|
| ---- | ---- | ---- | ----------- | ------------ | ---------- |
| 2 | 6 | 34 | 32-33 | 24-25 | 34-35 |
| 4 | 8 | 36 | 33-34 | 25-26 | 35-36 |
| 6 | 10 | 38 | 35-36 | 27-28 | 37-38 |
| 8 | 12 | 40 | 37-38 | 29-30 | 39-40 |
| 10 | 14 | 42 | 39-40 | 31-32 | 41-42 |
| 12 | 16 | 44 | 41-42 | 33-34 | 43-44 |
Bottoms (Standard Sizing)
| US | UK | EU | Waist (in) | Hip (in) | Inseam (in) |
|---|---|---|---|---|---|
| ---- | ---- | ---- | ------------ | ---------- | ------------- |
| S | 8 | 36 | 25-26 | 35-36 | 30 |
| M | 10 | 38 | 27-28 | 37-38 | 30.5 |
| L | 12 | 40 | 29-31 | 39-41 | 31 |
| XL | 14 | 42 | 32-34 | 42-44 | 31.5 |
Bottoms (Numeric Sizing)
| US | UK | EU | Waist (in) | Hip (in) | Inseam (in) |
|---|---|---|---|---|---|
| ---- | ---- | ---- | ------------ | ---------- | ------------- |
| 2 | 6 | 34 | 24-25 | 34-35 | 30 |
| 4 | 8 | 36 | 25-26 | 35-36 | 30 |
| 6 | 10 | 38 | 27-28 | 37-38 | 30.5 |
| 8 | 12 | 40 | 29-30 | 39-40 | 31 |
| 10 | 14 | 42 | 31-32 | 41-42 | 31 |
| 12 | 16 | 44 | 33-34 | 43-44 | 31.5 |
How to Measure
You'll need a soft tape measure and about two minutes. Measure over the undergarments you'd normally wear, and keep the tape snug but not tight.
Bust: Wrap the tape around the fullest part of your chest, keeping it level across your back.
Waist: Measure around the narrowest part of your torso, usually just above your belly button. Don't hold your stomach in; measure how you actually stand.
Hip: Measure around the fullest part of your hips and rear, roughly 8 inches below your waist.
Inseam: Measure from the top of your inner thigh straight down to your ankle bone. If you have a pair of pants that fit you well already, laying them flat and measuring the inner leg seam works just as well.
If your measurements fall between two sizes, size up for a relaxed fit and size down for something more fitted, especially for stretch fabrics like ponte, rib knit, and satin blends. Check the fabric content and fit notes on each product page; a style marked "oversized" or "relaxed fit" is cut larger than these charts on purpose.
Still not sure? Email support@astervienne.com (placeholder address, confirm before launch) with your measurements and the item you're eyeing, and we'll help you pick a size.