I was very economical with my "old" leggings last week. Rather than throw them out when they startedto go saggy, I took them on my winter holiday up snowy mountains, wore them under my jeans and then threw them away before i did my packing for coming home. Leggings hardly take up any room when you only take hand luggage and the discarded pairs left a bit of room for yummy swiss chocolate!
Got a nice pair of velvety leggings from M and s outlet a couple of weeks ago but a bit disappointed, after one wash I can seen shiny bit where I knelt down in them one time only. I agree with whoever said m and s arent big enough in the back bottom area, perhaps they might be better worn back to front, will give it a try!