without a strap or straps.
designed and made without shoulder straps: a strapless evening gown; a strapless bra.

1840–50; strap + -less Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
strapless (ˈstræplɪs)
(of a woman's formal dress, brassiere, etc) without straps over the shoulders

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
No bare midriffs or strapless tops, tube tops, body suits or swimsuits shall be
Tank tops, strapless tops and other clothing revealing excessive skin shall not
  be worn.
Underneath, she wears a dainty lingerie set made up of tap pants and a
  strapless chemise with garters and stockings.
Strapless, tube and halter tops, take tops and strapless dresses.
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