In which to pack his swimwear (6)

I believe the answer is:

trunks

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'swimwear' is the definition.
(I know that trunks is a type of swimwear)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for trunks that I've seen before include "Elephants can provide such cases" , "luggage" , "torsos" , "Men's swimsuit" , "Men's swimsuits on an elephants?" .)

I've seen this clue in the Sydney Morning Herald.

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