overdressing
o-ver-dress-ing
noun
The act of wearing clothes too formal or elaborate for a specific occasion.
"Her overdressing stood out at the casual pub lunch."
Thesaurus
Synonyms: fancy up, deck out, deck up, dress up, fig up, gussy up, get up, rig out, prink, attire, tog up, tog out
Antonyms: dress down, underdress