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Acaso Inc.

Siena’s Button Bikini Top

Siena’s Button Bikini Top

Regular price $65 USD
Regular price Sale price $65 USD
Sale Sold out
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Retro details. Modern support.

This top brings major vintage energy with black-and-white contrast trim, a sleek center ring, and two signature buttons where the shoulder straps meet the cups. It’s designed to flatter with just enough structure, featuring:

  • Elastic-lined shoulder straps wrapped in soft recycled fabric
  • Zigzag stitching for a nostalgic edge and gentle support
  • Adjustable tie-back for a custom fit on every body
  • Fully lined with a soft, lightweight interior

Wear it your way—whether you’re lounging poolside or making moves in the sun.

Fit Notes – Siena’s Button Bikini Top 

  • Xufe is 5'7" and wears an XS top
    – The elastic straps and adjustable tie-back give her a snug, supportive fit without any digging. The buttons sit just right over the bust.
  • Storrey is 5'6" and wears an XXL top
    – The top offers great coverage and support with room to adjust. The shoulder straps stay secure without slipping, and the tie-back allows for easy adjustment.

Fit tip: If you're between sizes, we recommend sizing down for a snugger fit—the elastic and tie-back will flex with you.

Product Specifications 

Shell: 80% Nylon, 20% Creora® HighClo™ Spandex
Lining: 88% Recycled Nylon, 12% Spandex

Available in sizes XXS - 4X 

SINGLE SIZE US NUMERIC SIZE WAIST HIPS BUST
XXS 00 23 - 24" 31 - 34" 30 - 31"
XS 0-2 24 - 26" 34 - 36.5" 31.5 - 33.5"
S 4-6 26.5 - 28.5" 37 - 39" 34 - 36"
M 8-10 29 - 31" 39.5 - 41.5" 36.5 - 38.5"
L 12-14 31.5 - 32.5" 42 - 44" 39 - 41"
XL 15 33 - 35" 44.5 - 46.5" 41.5 - 43.5"
XXL 16 35.5 - 37.5" 47 - 48" 44 - 45"
1X 14-16 38 - 39.5" 48 - 49" 45.5 - 47.5"
2X 18-20 40 - 41.5" 49.5 - 51" 48 - 50.5"
3X 22-24 42 - 45.5" 51.5 - 55" 51 - 53"
4X 26-28 46 - 49.5" 55.5 - 59" 53.5 - 55.5"
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