The pants look to be standard issue BDU military pants, with 4 custom-made pouches/pockets on the legs and buttocks area. The pants were dyed and painted with the standard Endor Rebel Camoflague pattern.
Area A in these images highlights what to be a standard pants pocket on the front side of the pants. The A? highlight in the second image shows no bulging of the pocket area, so we have to assume that the pocket has nothing in it, and it's not a pouch.
Area B highlights the leg pouches. Notice how the pouches are sewn very close to the front side of the pants leg. The pouches start to cover the kneecap area. Not sure why the Lucasfilms costumers did this, but it's not too ergonomic of a design for military soldiers.
We estimate this pouch to be approximately 15.3 cm (6 inches) wide and 22.8 cm (9 inches) tall. A 15.3 cm (6 inches) wide and 6.35 cm (2.5 inches) tall flap covers the top of the pouch. The pouch probably has a 2.5 cm (1 inch) wall around it, which is a typical design of military BDU pants.
Area C highlighted in the images shows bulging pockets on the buttocks area. We estimate these pockets to be 12.7 cm (5 inches) wide and 17.75 cm (7 inches) tall, with a 12.7 cm (5 inch) wide and 5 cm (2 inch) tall pocket flap.