Jersey (7)
(Other definitions for sweater that I've seen before include "Jumper (7)" , "Top" , "Jumper or jersey" , "Knitted upper garment" , "Long-sleeved pullover" .)
'jersey' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for shirt that I've seen before include "Male garment worn with tie" , "tailored garment" , "Garment for upper male body, usually cotton" , "One may lose it at the bookie's" , "Man's garment" .)