I love these pants soo much that I'm on my 4th pair but in ordering more than one pair I've noticed a change/difference in sizing each time I order. I am a size large normally but have noticed that a large can fit more like a medium (in one of my orders).  Then in another order the large was much bigger and fit like a large.  Same applies to X large too. Therefore one never really can be sure of ordering the correct size, that I find very annoying as I'd like them to fit the same, each time I order the same size.  It seems that the manufacturer is changing model sizes often.  Still like them though when they do fit, I guesse thats one of the reasons I have four pairs, getting that size just right!