Simple past tense and past participle of overdress.(adjective)
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Use "overdressed" in a sentence
""It is very unlikely that any one else will be in white or anything at all dressy, and you will look overdressed, which is in very bad taste; besides, though the weather seems warm enough for such thin material here on shore, it will be a great deal cooler on the water; and should the waves or spray come dashing over us, you would find your dress clinging to you like a wet rag -- neither beauty nor comfort in it.""
"And as for uncaring Mexican owners. .well you should see Spunky's other brother wearing his tee shirt all winter, or the other "overdressed" ones in this part of town."
"She was good-looking enough, in her thinnish, solemn way, but it seemed to me she was kind of overdressed and too grand."