Sirena Cut-Out One-Piece Swimsuit - Black

Size
Color: Black

The siren's silhouette.

Spiralling straps and sculpted cut-outs define the waist and draw the eye, in a one-piece swimsuit that moves with the body and commands attention from every angle. Crossover straps frame the bust and sweep through the waist, elongating the line of the body, while a polished O-ring accent adds a quiet, confident edge.

One suit, two ways to wear

  • The Halter: Cross the straps at the neckline and wrap them around the neck for a high halter with a sculpted keyhole at the bust.
  • The Plunge: Draw the straps up and over the shoulders for a deep V neckline that crosses through the waist in a striking architectural line.

Two ways to style one considered design. Wear Sirena poolside, on a spa escape or wherever the water calls.

The Fabric

Smooth against the skin, with stretch that follows the body and shape retention that holds its form. Sirena combines a sculpted silhouette with the flexibility and comfort of high-performance swimwear fabric. 

  • Black, Marrakesh, Marine: Perform. Composed of 80% polyamide and 20% elastane, Perform delivers a close, sculpting fit with four-way stretch and shape retention.

  • Olive: Life Power Recycled. Composed of 78% recycled polyamide and 22% elastane, this soft-touch fabric offers four-way stretch, muscle control and shape retention, alongside resistance to sun creams and oils.

Fabric Performance

  • Sculpting fit: Muscle control and shape retention designed to create a smooth, defined silhouette that holds its form season after season.
  • Four-way stretch: A true second-skin fit that moves with you.
  • Chlorine resistance: Made for pools, spas and hotel rooftops.
  • UV protection: Fabric designed to help protect against UV exposure.
  • Pilling resistance: Tested to 7,000 Martindale rotations.
  • Considered coverage: Designed for a confident, comfortable fit.

The Details

  • Cut-out one-piece swimsuit
  • Two styling options: plunge or crossover halter
  • Adjustable straps
  • Polished metal ring detail
  • Fully lined in matching fabric
  • Fabric composition varies by colour: Black, Marrakesh, Marine: 80% polyamide, 20% elastane. Olive: 78% recycled polyamide, 22% elastane.

*Please note: Colours may vary slightly from what you see on screen due to differences in display settings and lighting.

PRODUCT CARE

At Ban-dia, our swimwear is handcrafted in the UK using high-quality Italian and UK-made fabrics, carefully selected for their beauty, performance, and longevity. Each piece is designed with the intention that it will remain stunning season after season.To preserve the look and feel of your Ban-dia swimwear, please follow these care guidelines:

  • Rinse immediately after wearing
  • Do not scrunch or twist when wet
  • Hand wash gently using a mild detergent
  • Avoid fabric softener
  • Reshape while damp and lay flat to dry
  • Dry in the shade
  • Do not bleach, iron, tumble dry, or dry clean
  • Take care when using sun cream, lotions, oils, or in chlorinated water, as these may cause discolouration to some fabrics
View details
Our swimwear is designed to flatter a range of body shapes, with many styles offering adjustability rather than a single fixed fit. Crafted using stretch fabrics and thoughtful pattern cutting, each size allows for comfortable movement, gentle support, and a naturally flattering silhouette.
If you find yourself between sizes, personal preference can guide your choice:

  • Choose the smaller size for a more supportive, close-fitting feel
  • Choose the larger size for a more relaxed and comfortable fit
Every body is unique, and fit can also be influenced by how you prefer your swimwear to sit. If you’re unsure which size is right for you, we’re always happy to help. Simply get in touch with your measurements and we’ll advise as best we can.


SIZE BUST WAIST HIPS
INCHES CM INCHES CM INCHES CM
XS 29 - 31 73.5 - 78.5 20.75 - 23.75 52.5 - 60.5 30.75 - 33.75 78 - 86
S 32 - 34 81 - 86 24.75 - 26.75 63 - 68 34.75 - 36.75 88.5 - 93.5
M 36 - 38 91 - 98 28.75 - 30.75 73 - 78 38.75 - 40.75 98.5 - 103.5
L 40 - 43 101 - 108.5 32.75 - 35.75 83 - 90.5 42.75 - 45.75 108.5 - 116
XL 45.5 - 47.5 116 - 120.65 38.5 - 41.5 98 - 105.41 48.5 - 51.5 123.5 - 130.81