Size & Fit Guide

Finding Your Perfect Fit

At Wonsie, we believe comfort is personal. Our bodysuits are designed to support a diverse range of bodies, from young children and teens to adults and seniors.

Because every body is unique - especially through the torso - our size chart lists maximum measurements. These figures represent the largest body size each garment can comfortably accommodate while still allowing for natural flexibility and ease of movement.

How to Choose the Right Size

  • Go Beyond Age: While our numbered sizes (e.g., 4–10) align with general age ranges, we strongly recommend choosing your size based on physical measurements for the most accurate fit.

  • When to Size Up: If you are between sizes, have a longer torso, or are wearing nappies, we suggest selecting the next size up. This ensures the suit is easy to fasten and remains comfortable throughout the day.

  • The Golden Rule: The Girth Measurement is the most important factor for a comfortable fit. Please prioritize this measurement when reviewing the chart below.

How to Measure Girth

The girth measurement is the total circumference of the torso.

  1. Place a flexible tape measure at the center of the shoulder.

  2. Run it down the front of the body, through the crotch, and back up the rear to the starting point.

  3. Ensure the tape passes over the fullest part of the chest and stomach.

  4. Important: If the wearer uses nappies or diapers, please take this measurement while they are wearing one to ensure the suit fits correctly over the added bulk.

Teen & Adult Sizing

  • Sizes 12/XS to 22/XXL: These ranges are tailored specifically for teenage and adult proportions.

  • Larger Sizes: Our size 22/XXL is specifically designed to accommodate extra-tall or broader-framed adults.

Swimwear

Our swimwear features excellent 4-way stretch.
If you're between sizes, we suggest choosing the smaller size for a snug fit when wet.

Swim Nappies, Bibs & Accessories

Sizing varies by product. Please refer to each product listing for detailed sizing information.

Need a Size Exchange?

No worries! Please refer to our exchange policy or contact us at sales@wonsie.com.au - we’re always happy to assist.