How to select the size of our one piece?

• Main Fabric: 86%polyester/14%elastane , Lining: 100% Polyetser
• Hand wash cold separately, only non-chlorine bleach when needed, do not iron,do not dry clean,do not wring or twist line dry , for best results, rinse and line dry immediately after use
• Classic high cut one piece swimsuit,wide shoulder straps and more comfortable
• Fully Lined, Removable padding, Moderate coverage for bottom
• chlorine resistant