I found an old pair of wool slacks that I wore the crotch out of winter commuting, so I've trimmed them all down and taken out the pockets. I used this blog entry as inspiration except my trousers had a liner in it I removed... and they are pure wool instead of dickies. I also took apart the cut-offs and will arrange them to form crotch pad that'll cover the stitches in the crotch, though they never bothered me before. I don't find them itchy and with the liners and pockets gone they don't feel too bad at all.