This manufacturer seems to think that making the tights longer makes them fit larger women.  When I took mine out of the package, they were about a foot taller than I am.  The waist was MUCH too tight, and though I got them on, they were extremely uncomfortable, and I looked like an armadillo with the wrinkles all the extra length left.  I went barelegged to my daughter's graduation.  I'm 5'5", 220 lbs and ordered 4x.