5.11 Tac light pro, IIRC.
They were around $70 but the waist stretches and there are a lot of pockets and also the fabric is tough and doesn't stain easily. Dripped coffee wipes right off and doesn't leave much of a mark.
I have not used them for heavy fabrication/auto work where they would get extremely dirty and they will likely melt from sparks since they are 65% polyester and 35% cotton.
The work I wear these for is doing sharpening and repairs, as well as sales, for the grooming industry where I have to go to the customer's location. These are comfortable for driving, kneeling, etc. and the pen pocket is great as I don't wear shirts with pockets. When I compete at the shooting range, the pockets work good for AR mags, stick mags for my carbine, and extra pistol mags that don't go on my belt. The dirt and oils from the guns washes right out.
For welding, I use my painters pants (used to be a painter) but they are blended as well and melt from sparks. They also don't cost nearly as much as 5.11 pants. Jeans may be an option for darker work pants, but the comfort doesn't compare to the 5.11 and painters pants are more flexible than some jeans.