I usually wear an IX but order both the 2X and 1X.  The 1X fit me fine in the waist, hips and upper thighs but were huge on the lower leg - I'm guessing they make them this way so you can put them on and take them off without taking your shoes off.  I'm 5'5" and they were about 2-3" too long.  Because they have Velcro at the bottom, I took a tuck around the leg to shorten them and used Gorilla tape on the inside to secure the tuck.  It worked. The pants appear to be very waterproof and I will be testing them out soon.