New Yorker boots swimmers (6)

I believe the answer is:

trunks

I'm a little stuck... Click here to teach me more about this clue!

'new yorker boots' is the definition.
'trunks' can be an answer for 'boots' ('trunk' can be a synonym of 'boot'). I'm unsure of the 'new yorker' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for trunks that I've seen before include "luggage" , "Elephants can provide such cases" , "Underwear for elephants?" , "Parts of trees and elephants" , "Main stems of trees" .)

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

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