noun
backless dress; backless swimsuit
Refers to clothing that exposes the back, especially dresses and bathing suits. Common in fashion contexts.
彼女はパーティーにバックレスのドレスを着て行った。
She went to the party wearing a backless dress.
今年の水着はバックレスのデザインが人気だ。
Backless designs are popular for swimsuits this year.