There are all sorts of distinctions that you could make, but you are looking for a general term, just as general as "Winterjacke" and winter jacket is right.

...'winter coat'- Winterjacke, Wintermantel

(Winterkleidung - winter outerware)

it is not at all clear - do you mean a cardigan or a sportsjacket or what

Gibt es dafür ein eigenes Wort, oder inmmt man da einfach "winter jacket/ coat"? Und gibt es einen Begriff für "Skihose"????