What’s a good pair of pants for delivery workers?

I’m in and out of my van a lot, lifting grabbing bending pulling dragging all sort all the time. My pants are always rolling down and slipping down. I’m a bigger set person and nothing else fits besides stretchy yoga pants. But it’s tiresome pulling them up over my skin all the time and getting rashes constantly.
There’s gotta be a better way to comfortably wear clothes with this job!
What’s a good pair of pants for delivery workers?
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