What is the difference between a shelf bra and a built in bra?

While both built-in bras and shelf bras are integrated into garments, there are some key differences in their construction and the level of support they provide. Built-in bras often offer more structured support, shaping, and coverage compared to simple shelf bras.

In contrast, shelf bras are usually just an extra layer of fabric and elastic sewn into the garment. They provide light support and modesty but minimal shaping or separation. Shelf bras sometimes only extend from side seam to side seam in the front, while built-in bras typically wrap all the way around the back for added support.