M.J.
I am 5'6.5" with long legs I have a problem with elastic waist pants not being long enough in some brands. Old Navy are too short but Gap are just right. I buy a Medium. I never put in the dryer, I hang to dry. I have a folding rack that I put up. You can also throw them over the shower rod overnight. If I put them into the dryer they will be to short. Putting them into the dryer starts to break down the lycra and they don't last as long too.
It's really hard for me to find PJ pants. I cannot buy cotton ones as I like to dry my PJ pants. That really soft, thin, stretchy fabric that is made by Gillian O'Malley from Target work and they don't shrink. http://www.target.com/p/gilligan-o-malley-women-s-fluid-k...