What is Dressed ?
Dressed is (adj) 1. wearing clothes I can’t come down to see the visitors I’m not dressed yet. She was dressed all in black. to get dressed to dress yourself Get dressed and come downstairs. He got up, got dressed and then had breakfast. dressed to kill wearing your best clothes 2. dressed (up) as wearing the costume of He went to the party dressed (up) as a policeman. dressed up to the nines wearing your very best clothes I saw her going out all dressed up to the nines.
source: Easier English, Student Dictionary Upper Intermediate Level