I wear 34x34 Levis and originall bought the 34" pants. They fit a bit too snug around the waist when seated with the water resistant liner in -- just find with the liner removed. I exchanged for the 36" pants which fit just right with the liner in, although a bit long. With the liner out they are too big, but I bought mainly for the water resistantness and the protection from windchill. I need to have them hemmed, but like them so far.
Also a BIG plus was the zips along the legs rather than velcro. I hate messing with velcro.