Sleeveless top or underwear (4)
I believe the answer is:
vest
I believe this clue is a double definition.
'sleeveless top' is the first definition.
(a vest is a garment without sleeves)
'underwear' is the second definition.
(Other definitions for vest that I've seen before include "Clothe in ecclesiastical garments" , "Undergarment for upper body" , "Undershirt, singlet" , "Undergarment covering trunk of body" , "American version of waistcoat" .)