Wiktionary
a. (context of a garment English) not covering the shoulders.
WordNet
adj. not covering the shoulders (especially inthe case of a blouse or dress)
Usage examples of "off-the-shoulder".
Evangeline Shreck, tall, slender and positively waiflike in an off-the-shoulder gown, watched her beloved Finlay talking with the notorious Valentine Wolfe and felt an almost overpowering urge to rush over and rescue him.
I remembered her from the restaurant, so long ago, in the candelight, in the svelte, off-the-shoulder, white-sheath dress, so chic and lovely, carrying the tiny, silver-beaded purse.
She had worn an off-the-shoulder, svelte, white satin sheath dress.
She is always wearing things like Day-Glo high-top sneakers, cut-up jeans, off-the-shoulder sweat shirts (sometimes torn), and friendship bracelets.