Size Chart


Generally, you should order your pre-pregnancy size (in other words, the size you wore before you were pregnant). Our sizing takes into account weight gain and a growing belly all the way to 9 months. When selecting your size, use the measurements chart below as a guide.
Pre-Pregnancy Size 4-6 8-10 12-14 16-18 20 22 24
Mermaid Maternity® Size Small Medium Large XL XXL 2X 3X
Current Bust Measurement* (inches) 36- 37.5 38-40 40.5-42.5 43-45 46-48 47-49 50-52
Current Hip Measurement** (inches) 38-39.5 40-42 42.5-44.5 45-47 48-50 49-51 52-54
* For bust measurement, measure around the fullest part of your bust
** For hip measurement, stand with feet together and measure around the fullest part of your hips For larger bust sizes: If your bra cup size is DDD or higher, you may want to go up 1 size, but we do not recommend going up 2 sizes. For example, if you normally wear a size medium in a fitted t-shirt but your bust measurement falls within the 'Large' box in our size chart, you should order a size large. However, if you wear a size medium in a fitted t-shirt but your bust measurement falls within the 'XL' box in our size chart, we recommend ordering a size large, not an XL. If you have specific fit questions, feel free to contact us. When you try on your swimwear, keep in mind that it will stretch a bit when wet.