Changes dresses (6)
I believe the answer is:
shifts
This clue is a double definition.
'changes' is the first definition.
(shift is a kind of change)
'dresses' is the second definition.
(shift is a kind of dress)
(Other definitions for shifts that I've seen before include "Moves for work sessions" , "Moves with work periods" , "Changes from one position to another" .)