(Reply is not working on mobile. This is to Aaron.) It is not plural. Plural is "women's sweaters" (with the extra "s"). Think of it this way: you could write "a women's sweater" as "a sweater for women".
Why is the English translation of светр "jumper"? Shouldn't it be "sweater".
It's British, I found out. In American, a jumper is jumpsuit or a "one-sie." A светр is just a sweater
British say, "jumper" and Americans say, "sweater."
There is a mistake in this answer : a woman’s sweater.
Why is he looking for a women's sweater?
for a daughter or the wife, for ex.
He is looking for a woman's sweater. (Woman - singular)
The word 'women' is plural. And if you want to use it, then the correct sentence would read : He is looking for women's sweaters.