How to Find the Right Maternity Swimsuit for You

While they still sell plenty of traditional skirted suits, Matthias says that Mothers Work's bread and butter are tankinis. Why so popular? Matthias points out that women can mix and match the tops and bottoms. If you're a serious beachgoer, being able to quickly and easily use the bathroom is another plus with a two-piece.

When it comes to fabric, Matthias recommends textured fabrics, which can smooth over lumps and bumps to flatter any figure.

Black is still a hot seller year round, but Atkin notes that chocolate brown solid suits are also gaining in popularity, while brighter colors and prints seem to sell better in warmer months. She also adds that many of her customers like to color coordinate suits to match the gender of their baby-to-be. "The bright pinks and aquas are always popular and usually chosen based upon the gender of the baby the woman is expecting." Other fun colors? Mango, lavender, and jade for the summer, suggests Atkin, and "funky, light-hearted prints like polka-dots and large, bright floral patterns."