Crossword Genius

Old-fashioned garb for TT? (7)

Ross

I believe the answer is:

doublet

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'old-fashioned garb' 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?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for doublet that I've seen before include "would be seen in battle" , "Pairing" , "Historical jacket" , "Old garment worn with hose" , "Pair of similar things" .)

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