bodysuit

/ˈbɑdiˌsut/
noun
  1. A one-piece, tight-fitting garment that covers the torso and sometimes the arms and legs, often worn as underwear or as a fashion item.
    • She wore a black bodysuit under her jeans for a smooth look.
    • He bought a long-sleeved bodysuit to wear as a base layer in cold weather.
    • The dancer's bodysuit was covered in sequins for the performance.