I posted a reply to LadyJais post but to restate it here:

one brands size 8,10 as anothers 10,12 is anothers 6,8! I hang around between an 8-10 in the winter and a 6-8 in the summer.....half the time I don't know what size I'm wearing, but they're comfortable and I can wear them all day! That is more important to me then what "size" they are! oh...and that I can climb that dang-blasted mountain home every night!