Garment unusual in cut (5)
I believe the answer is:
tunic
'garment' is the definition.
(tunic is a kind of garment)
'unusual in cut' is the wordplay.
'unusual' indicates anagramming the letters.
'in'+'cut'='incut'
'incut' with letters rearranged gives 'TUNIC'.
(Other definitions for tunic that I've seen before include "Close fitting jacket as part of uniform" , "(Policeman's) jacket" , "Clobber" , "Roman garment" , "School garment" .)