Definition of dressed adjective from the Oxford Advanced Learner's Dictionary

Oxford3000

dressed

adjective
drest
 
; drest
 
[not before noun]
 
1 wearing clothes and not naked or wearing clothes for sleepingHurry up and get dressed.fully dressedI can't go to the door—I'm not dressed yet.2 wearing clothes of a particular typesmartly dresseddressed in… The bride was dressed in white.He was casually dressed in jeans and a T-shirt.
Idioms

dressed to kill

(informal) wearing the kind of clothes that will make people notice and admire you

dressed (up) to the nines

(informal) wearing very elegant or formal clothes
more at mutton dressed as lamb at mutton