Sweater (8)
'sweater' is the definition.
(pullover is a kind of sweater)
This is all the clue.
(Other definitions for pullover that I've seen before include "Sweater or jumper" , "Go to side of road" , "Knitted garment" , "Woolly" , "top gear?" .)
(Other definitions for vest that I've seen before include "Undergarment to put in right of possession" , "Thesaurus compiler" , "Upper undergarment, singlet" , "Undergarment for upper body" , "Undergarment for vets" .)