Baby Shower Corsage & Maternity Sash - The Tradition Having a baby shower corsage and/or a maternity sash is a special tradition to honor the mom-to-be. On the day of the baby shower, the hostess traditionally offers the baby shower corsage and/or the maternity sash to the mom-to-be. The mommy-to-be may wear it: at her baby shower; during a maternity photo shoot; post pregnancy during your newborn baby photoshoot; or it can be used as a prop by the baby. Baby Shower Corsages & Mommy To Be Sashes - What Is It Anyway? Corsages are traditionally worn to honor people.