1760s, from dress (v.) + -y (2).
For as her natural face decays, her skill improves in making the artificial one. Well, nothing diverts me more than one of those fine, old, dressy things, who thinks to conceal her age by everywhere exposing her person; sticking herself up in the front of a side-box; trailing through a minuet at Almack's; and then, in the public gardens looking, for all the world, like one of the painted ruins of the place. [Goldsmith, "The Good Natured Man," 1768]
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