The right fit changes everything. This SLIUET size guide covers bras, panties, sleepwear, shapewear and activewear — and if you are ever between sizes, our fit specialists are one message away.
Use a soft measuring tape over unpadded underwear. Keep the tape level and snug, not tight.
Underbust: measure directly under your bust, where a bra band sits. Bust: measure around the fullest part. Waist: the narrowest point of your torso. Hip: the fullest part of your hips.
| Band Size | Underbust (in) | Underbust (cm) |
|---|---|---|
| 32 | 27–28.5 | 68–72 |
| 34 | 29–30.5 | 73–77 |
| 36 | 31–33 | 78–83 |
| 38 | 33.5–35 | 84–89 |
| 40 | 35.5–37.5 | 90–95 |
Your cup size is the difference between bust and underbust: 4 in ≈ A, 5 in ≈ B, 6 in ≈ C, 7 in ≈ D, 8 in ≈ DD.
| Size | Bust (in) | Waist (in) | Hip (in) |
|---|---|---|---|
| XS | 31–32.5 | 24–25.5 | 34–35.5 |
| S | 33–34.5 | 26–27.5 | 36–37.5 |
| M | 35–37 | 28–30 | 38–40 |
| L | 37.5–40 | 30.5–33 | 40.5–43 |
| XL | 40.5–43.5 | 33.5–36.5 | 43.5–46.5 |
| XXL | 44–47 | 37–40 | 47–50 |
Bras: if you are between band sizes, size up in the band. Shapewear: choose your true size — SLIUET shapewear sculpts without squeezing, so sizing down only sacrifices comfort. Activewear: true to size, with high-stretch recovery knits. Sleepwear and loungewear: relaxed fits — size down for a closer silhouette.
Still unsure? Ask a SLIUET fit specialist — every message is answered personally. Then find your fit in the collection.