Sexy clothing can be intimidating. Be it a body-hugging bondage dress or a skin-baring backless top, it takes a lot of self-confidence to pull it off. Of course, a little undercover help doesn't hurt either. With the right underwear and shapewear, everything will fall (or get squeezed, tucked, and lifted) into its right place. Wearing the correct undergarment can hold you in, flatter your shape, and prevent unseemly lines. Scroll through the gallery to see which pieces you should have in your closet!