Are these good for actual work, not just fashion?

Yes. The double front panels add a second layer over the thigh and knee area, which is where work overalls wear through first. The 10.2 oz denim is mid-weight, heavier than typical fashion denim.

How does the stretch denim feel?

The blend includes 2% spandex, so the fabric gives as you bend and squat. It will feel softer and more flexible than rigid 100% cotton work denim, though it may not mold to you the way unwashed denim does.

What inseam should I pick?

Regular is a 31-inch inseam and Short is 29 inches. Measure a pair of pants that fit you well and match that inseam, since the straight leg is not meant to be rolled.

Do they have knee pad pockets?

The double front is a reinforced fabric panel, not a pad pocket. If you need insertable knee pads, look for overalls built with dedicated pad sleeves.

Are they true to size?

The listing gives no fit guidance beyond the inseams. The stretch blend and straight leg suggest a regular, slightly relaxed fit, so most shoppers can take their usual size.