I think maybe the yanks of the time would have called it a windcheater. It was also known as a 'Windjammer' or a 'Windbreaker', both of which were brand names, (just like we say 'biro' for ball-point and 'hoover' for vacuum cleaner). You can see the similarity with the 'Windbreaker' brand, below. Or maybe just a 'zipper jacket'. Is there a sociolinguist in the house who specialises in US vernacular? LOL.
2/22/15 at 11:17pm