I would love to find a pair of knee pads that fit fat legs. I ride singletrack, or just easy stuff – because that’s mostly what’s around here – so I don’t need anything super aggressive.
I wear knee pads for volleyball. I have bought the largest size that I can find, and I still have to cut the elastic from the top to the middle. The elastic is then just around my lower leg, from the crease of the back of my knee, down.
I have muscular calves, and muscular/fat upper legs. It’s my body type and there’s little I can do about it.