be (all) dressed up like a Christmas tree

old-fashioned To be dressed or decorated very ostentatiously; to be who is particularly pretentious or showy in appearance. She was dressed up like a Christmas tree, swanning about in all her furs and jewelry. Why are you all dressed up like a Christmas tree? We're only going to the movies. I'm all dressed up like a Christmas tree because the CEO was supposed to visit our office today.

See also: Christmas, dress, like, tree, up

See also:

Astor
Mrs. Astor's pet horse
Mrs. Astor's plush horse
pet
(all) dressed up like a Christmas tree
dressed (up) like a dog's dinner
dressed like a dog's dinner
dressed up like a dog's dinner
dressed to kill/to the nines
dressed to a/the T

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