They're worn in pairs (6)

I believe the answer is:

braces

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'pairs' is the definition.
('brace' can be a synonym of 'pair')

I don't understand the remainder of the clue.

(Other definitions for braces that I've seen before include "Supports for men's trousers" , "straps to hold your trousers up" , "They hold up men's trousers" , "Tighten" , "Supports for teeth or trousers" .)

I've seen this clue in the Evening Standard.

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