These pants in particular:

https://ufpro.com/us/pants/combat-pants/striker-xt-gen-3-combat-pants

They come with an awesome elastic and Velcro belt. The cargo pockets are big enough to lose several phones in. You can use it to conceal carry in the cargo pockets by inserting the barrel into the forward of the two elastic retaining straps inside the pocket. They have ventilation and you can buy merino wool/leather thermal liners that are incredible too. They may be the perfect pants.