the snaps above the knees are actually leg vents. this picture shows how they open up.
The right leg opens up to the upper thigh. The zipper for that starts at the upper thigh and goes down to the ankle.
As far as pockets go on the suit...there is a hidden chest pocket on the inner side of the front flap of the suit, and there are two pockets on the legs and a backpack pocket on the back of the suit (similar to the lombard)