All-in-one and Leotard

Leotard and all-in-one are semantically related. In some cases you can use "Leotard" instead a noun phrase "All-in-one".

Leotard noun - A tight-fitting garment of stretchy material that covers the body from the shoulders to the thighs (and may have long sleeves or legs reaching down to the ankles); worn by ballet dancers and acrobats for practice or performance.

All-in-one and leotard are semantically related. You can use "All-in-one" instead a noun "Leotard".