Sizing Card
Siren's Boutique Sizing Card
Every order ships with a printed sizing card showing measurements across four size systems. This is the same chart, online for reference before you order.
Bikini sizing (top + bottom)
| Size | AU / UK | US | EU | Bust (cm) | Waist (cm) | Hip (cm) |
|---|---|---|---|---|---|---|
| XS | 6 | 2 | 34 | 78–82 | 60–64 | 86–90 |
| S | 8 | 4 | 36 | 82–86 | 64–68 | 90–94 |
| M | 10 | 6 | 38 | 86–90 | 68–72 | 94–98 |
| L | 12 | 8 | 40 | 90–94 | 72–76 | 98–102 |
| XL | 14 | 10 | 42 | 94–98 | 76–80 | 104–108 |
| XXL | 16 | 12 | 44 | 100–104 | 82–86 | 110–114 |
| 3XL | 18 | 14 | 46 | 106–110 | 88–92 | 116–120 |
One-piece sizing
Same bust/waist/hip ranges as above. For one-pieces, also check torso length — measured from the shoulder, over the bust, through the crotch, and back up to the same shoulder. If your torso measurement is over 165 cm, size up one for a comfortable fit.
How to measure
- Bust: Around the fullest part, parallel to the floor.
- Waist: The narrowest point, usually about 2.5cm above your belly button.
- Hip: Around the fullest part of the hips and bottom.
Between sizes?
Size up. Our fabrics have high recovery — they hold shape over 100+ wash cycles, so a slightly looser fit settles in beautifully and stays comfortable.
Returns
Free size-swap returns within 30 days on unworn pieces (hygiene seal intact). See our refund policy for details.
Questions?
Reach us at boutiquesirens@gmail.com or DM @sirens.boutique on Instagram. Founder-led customer service for the first thousand orders.
Engineered for sun, sea, and sand.