I bought these for my husband for Christmas.  He has an old pair that have seen better days (not Carhartt)... He's been duct taping the leg zipper shut for a year, now.
I did not read the entire product page, and ordered this in his regular jeans size, so of course they were too small to wear over his jeans and I had to order the next waist-size up.  My fault!
He really likes them and they are very warm.  They fit very well (now that I ordered the correct size, duh)