In reply to alan barnes:
Be that like if you must. But do you wear a jumper or a vest and, if so, where?
Do you wear over-trousers, over-pants, waterproof pants or waterproof trousers?
And yes, 'pants' is derived from pantalon, via pantaloon.
Trousers is derived from trouse or trews, and is therefore altogther more acceptable