Sweater with a close-fitting, doubled-over collar (4-4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
polo-neck
(Other definitions for polo-neck that I've seen before include "Style of sweater collar" , "A high turned-over collar on a jumper" , "Type of jumper" , "Type of sweater collar" , "Pullover, high turned collar" .)