"Marine" foul weather gear has patches and reinforcement in different areas. For instance the butt on my foul weather pants is reinforced and has a coarser weave cloth that won't slip on seats too easily. They are cut higher in the waist, so my jacket overlaps by quite a bit. They are insulated a bit like ski pants, but not so much to make them too warm. They breath pretty well and are waterproof.
They sound exactly like snowboard pants. Snowboard pants are reinforced in the butt for when you are sitting in the snow putting on your boots/bindings.
reinforced at the knee
cut higher at the waist mostly, so snow wont get up your jacket and down your pants.
alot of them aren't that warm, they are made to be worn in spring temps or with a base layer.
waterproof and breatheable.