The word trousers is normally used by older gentleman in Britain. Depending on where people are from they are brought up using different words that ultimately mean the same thing.
you say pantolenes
Pants is short for pantaloons which nobody wears these days. American English uses "pants" as the accepted alternative to the British "trousers" . The British use the word "pants"/"pantaloons" to refer to underwear which were about as long as normal trousers. Usually, though Americans would say "pants" which is perfectly fine.
trowsus
The British say 'z' as zed.
British people say quite a lot of things. They are sometimes known to say, God save the queen.
the person who wore the trousers was the leader of the relationship, what they say goes
You can say "pantalones impermeables".
Cousin is the same as how you say it in America but with a British accent. British people speak English.
pantalon d'école
What's up britches!
un pantalon noir
British people say quite a lot of things. They are sometimes known to say, God save the queen.