Any article of upper clothing which isn't held up by support of the shoulders or arms, such as shoulder straps or attached sleeves. Tube tops are a prominent example of strapless clothing.
Strapless is mutually exclusive to sleeveless; they should NOT be used together to describe the same clothing.
The following tags implicate this tag: strapless_bikini, strapless_bra, strapless_dress, strapless_leotard, strapless_shirt, strapless_swimsuit, and tube_top (learn more).