A brewer's outerwear? (3,4)
I believe the answer is:
tea cosy
'a brewer's outerwear?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
This is the entire clue.
Can you help me to learn more?
(Other definitions for tea cosy that I've seen before include "leaves in a hot state in this?" , "Pot cover" , "put on for warmth" , "Knitted item" , "It keeps the beverage hot" .)