Loose-fitting top (5)
(Other definitions for tunic that I've seen before include "Close fitting jacket as part of uniform" , "Short uniform coat" , "Loose sleeveless garment" , "Shift" , "Roman garment" .)
'loose-fitting top' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for blouse that I've seen before include "Woman's shirtlike garment" , "Female garment" , "Woman's buttoned top" , "Top garment - so blue (anag)" , "Shirt-like garment for women" .)