What does 'sweater' mean?

[Sweaty]

English Grammar Tests, Elementary Level

ESL/EFL Test #116 "Weather Test (3)", question 1

People wear coats and ......... in order to keep warm in the cold winter months.

(a) shorts
(b) skirts
(c) sweaters

English Grammar Tests, Elementary Level

ESL/EFL Test #116 "Weather Test (3)", answer 1

People wear coats and sweaters in order to keep warm in the cold winter months.

Correct answer: (c) sweaters
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why sweater?

[Linda]

Hello,
Sweaters keep us warm and are often worn in the colder months. No one would say "put on a skirt/shorts in order to keep warm" because legs are exposed to the cold elements etc. with both skirts/shorts.
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