Open to view — how a pullover might be worn (5)
I believe the answer is:
overt
'open to view' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
(Other definitions for overt that I've seen before include "Plain and obvious" , "Explicit" , "____ is able to be seen" , "Open, up front" , "Open and observable" .)