A slip also makes sheer clothes appear opaque and prevents coarse fabrics from chafing your skin. A full slip conceals other lingerie items and makes dresses fill out so they don't bunch up. The four popular styles are regular, bra, strapless, and shapewear full slips. A regular one provides ample coverage from bust to thigh, while a bra type replaces the need for a separate bra. Strapless slips are best for evening gowns that leave the shoulders exposed, while shapewear slips are figure-hugging undergarments.