dressed vs dressed to the nines

dressed and dressed to the nines both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dressed	No	Yes	No	No
dressed to the nines	No	Yes	No	No

As adjectives, dressed and dressed to the nines are synonyms defined as:

Other synonyms of dressed include dolled up, dressed-up, dressed to kill, spiffed up, spruced up, togged up.

dressed (adjective)	dressed to the nines (adjective)
dressed or clothed especially in fine attire; often used in combination	dressed in fancy or formal clothing
(of lumber or stone) to trim and smooth
treated with medications and protective covering
dressed in fancy or formal clothing