The Rosie Dress. Styles for the summer, meet the Rosie. This season's must-have dress for every occasion, wear it day to night, for an effortless chic look. It features a maxi length with a thigh-high split, made from the signature Bumpsuit 4-way stretch brushed jersey fabric for all-day support and fit.   Product description.  Super soft 4-way stretch fabric. Brushed jersey for fit and support.  Double-lined.  97% polyester, 3% spandex. Sizing.  Bumpsuit material is made to gently stretch with the body through the stages of pregnancy. We recommend ordering Bumpsuit in your regular size.  Our models are all wearing size S. Bumpsuit makes high-quality maternity and postpartum clothing that is easy to style throughout the seasons of pregnancy and beyond.