Use 'backless' to describe outfits with an open back, often considered stylish and elegant. The bridesmaids all chose backless gowns for the summer wedding.
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Furniture Application
'Backless' pieces of furniture like stools may not provide back support but can be fashionable or space-saving. The kitchen island was surrounded by backless bar stools.
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Social Perception
Backless clothing can be seen as more revealing; cultural norms influence its appropriateness in different settings. At the conservative gala, her backless outfit drew disapproving glances.