I am not in the 501st, but I wore one of the suits for about 5 hours during the opening ceremony. The movement IS restricted, due to the design. The arms and legs are sealed with rubber gaskets between the parts and it does not allow for ease of movement. With that being said, we still climbed steep stairs and were able to hold our guns pretty easily.
Don't think you can easily sit.
Can't drop to a knee.
Can't easily remove your own helmet.
This is NOT an ANOVOS issue, but limitations of the costume design. If you were willing to be less true to the original design, a number of these limitations could be overcome.