Like garb for a gala (6)
I believe the answer is:
dressy
'like garb for a gala' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dressy that I've seen before include "Elaborate" , "(Of clothes) suitable for a smart occasion" , "Wearing stylish clothes, elegant (6)" , "Liking to wear fancy or formal clothes" , "swish" .)