Pants: unless it’s for weather related reasons, I can’t see why jeans won’t work,
As long as they’re the right jeans.
Eg. my daughter wore low-rise jeans to a Project Appleseed, against my suggestion, and got hot .22 brass down her butt.
I bet we can start a massive P-F thread on tactical jeans.
Here’s a pic I dug up from a Practical Rifle match several years ago. Note the kneepads. There’s a moving steel target way back there on rails that pass behind the barrel stacks.
And here’s a pic of Iain from Top Shot at PR from way back.