trousers (pants in american) are fine.
just don't wear those trousers that are actually very tight leggings with a pattern of pockets on them to make them look like trousers!
in other words, if your trousers are of very thin material and very tight, wear a loose shirt over it to avoid distracting the world with your lovely bottom.
if you wear very trendy ripped jeans and a loose knitted top with lots of holes in it you will probably be decent, but most copts dress a bit smarter than that. no need to wear a suit or anything though, anything in between is fine.
and salpy, i think he meant cover your cleavage, not bring your cleavage!