One of the most popular styles of maternity jeans are maternity bootcut jeans. With a slightly flared leg opening, boot cut maternity jeans are cut to flatter your legs and serve as a key to much of your maternity wardrobe. Stock up with several pairs in both dark and light washes, and wear them with everything from maternity blouses to maternity sweaters. This is one basic you can dress up or down, so have fun.