Mind the peasants. They have jackets.
From the French for jaque, a kind of tunic, possibly based on the generic term for French peasants. Maybe even some of your more distant relatives.
A short, tight-fitting, sleeved coat, waist-length to hip-length, worn on the upper body, as is proper for such garments. If only a shell, it keeps out wind and some cold by forming a bubble of retained, body-heated air next to the body, but can just as well be insulated. May also be breathable, non-breathable, windproof, waterproof, or a combination. Or not. Confused yet?
Example: Jane put on her jacket to keep out mosquitoes and found that it worked. Since it was camo, she instantly became invisible.
And...The outer skin of a potato, sometimes worn as clothing, if the potato is big enough, though less useful in bear country.
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Me? Recently drenched in butter and covered with sour cream. The cat now likes me. Worse has happened.