I picked up one pair that are flannel lined for when I am waiting for the bus this coming winter. Of the slippery pairs I own, I managed to find a pair very similar to the pair I like best in the store & tried them on. Too big in the size I picked and from the evidence of the other pair, they will stretch and fall down too. Try the next size down.
The next size down, was the most unattractive fit I have ever encountered. Yet, they were the same style, should have been exactly the same cut, just a bit smaller. Well, they were a lot smaller in the seam that goes under the crotch, you know - the one that gives camel toe.
I had always assumed that women with that problem were wearing pants they had out grown, or that had shrunk, I was unaware that you could purchase it directly off the shelf! I went out to show my friends and they got these looks on their faces...when I turned and looked in the mirror - all I could think of was something I had read a few days earlier "excuse me, I think your camel toe just spit on my shoes". Sadly I can't remember where I read that to give credit where it is due, but it started me laughing and I couldn't even explain why.
I did find another pair that fits and hopefully will still fit after washing. I do hate shopping so much.
Have a good weekend all.