Allan, you sound a little like a ole swabbie calling them dungarees, but the seam has never been a problem. Typically I will take the bottom of the leg and wrapped it around my leg and secure it with an elastic piece or the top of my wool socks, which are also very heavy and may provide cushioning to protect
Marco, you ask a question about underwear and you get a response about underwear, what did you expect? It's underwear, not rocket science.