cargo pants

US /ˈkɑːr.ɡoʊ ˌpænts/
UK /ˈkɑːr.ɡoʊ ˌpænts/
"cargo pants" picture
1.

loose-fitting casual trousers with large pockets on the sides of the legs, typically made of cotton

:
He wore a t-shirt and cargo pants for the hike.
Cargo pants are practical for outdoor activities due to their many pockets.