How often you should wash it: After one to three wears.
Washing guidelines: Generally, if you layer briefs underneath, you can sport these suckers a few times. Prefer not to hand wash? Toss shapewear in a mesh lingerie bag and wash on a delicate cycle in cold water.
What else you should know: Ditch the fabric softener and the dryer, says Cobb. They damage the elasticity (hey, Spanx don’t come cheap!). Instead, lay pieces flat to dry.