I want to sew some pockets onto my Carhartts and stuff decent knee pads in em. Nice comfy insulated coveralls... As everyone knows, there's a big difference as to where the pad/s cover your knees depending on whether your're standing or sitting. I want long ones. I'm thinking that will also cure my 'cold knees' problem. Where are some places to get good pads...other than the carpet outlet store?