1
general::
Also, all gussied up. Dressed up, as in Dana loves to get all gussied up and go to a fine restaurant. The origin of this expression is not clear, though possibly it relates to the earlier use of the noun gussie (derived from a proper name) for an effeminate man. [Slang; mid-1900s]
American Heritage Idioms
2
general::
Phrase(s): gussied up
Rur. dressed up fancy. • All the girls got gussied up for the dance, but the guys wore their regular clothes. • Mary really got gussied up. She even curled her hair.
McGrawhill's American Idioms And Phrasal Verbs