Translation of "knickerbocker" into English

Monsieur Leclair, als man van goede smaak zorgt u ervoor dat Mr Selfridge arriveert in de laatste knickerbockers?

Monsieur Leclair, as you are a man of taste, will you make sure that Mr Selfridge arrives in the latest knickerbockers?

Als je ze vanavond de Knickerbockers noemt, steken ze je neer in de kleedkamer.

You call them the Knickerbockers tonight, you can get stabbed dead in the men's room.