When I realised I had no real need for extra pockets other than your standard two front and two back you get on all trousers and that my conditions for work very rarely involved building site/hazardours conditions requiring thick material protection I started just buying pairs of whatever fitted well and was comfortable (usually meaning softer, thinner and more flexible/stretchy than tradesemen trousers) that I could find for £20 at T K Maxx. Never going back to heavy, thick tradesemen's trousers again. They also fit better over trainers as I don't wear boots.
What about knee pads I couldn't work without knee pads or use those with a strap behind the knee.