Swimwear for large chests (6)

I believe the answer is:

trunks

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'swimwear' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for trunks that I've seen before include "Swimming garments or tree stems" , "Men's swimsuit" , "Main stems of trees" , "Man's swimming costume" , "torsos" .)

I've seen this clue in The Times and The Sunday Times.

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