Green’s Dictionary of Slang

sweater n.2

[SE sweater]

1. (US Und.) a strait jacket.

[US]Monteleone Criminal Sl. (rev. edn).

2. a condom.

[US]D. Lypchuk ‘A dirty little story’ in eye mag. 8 July [Internet] The two of them dabbed the brush, danced the goat’s jig, dug in the whisker and swept the chimney until, just as he was about to do her a kindness, his sweater fell off and he had to put a new willy-welly on.