If you look at the b/w gallery image below and use a ruler or mark a piece of paper, you will see that Fett's belt and thigh pouches appear square, not rectangular. You also see that
they are wider than the 3 ammo pouches on his left.
The image also appears to show the belt pouches to be thicker than the leather ammo pouches.
I would say the pouches should be 6.5 inches x 6.5 inches x 2 inches.
My flight suit is based on the WOF templates, and they do not look right - in person. My pouches, although they appear square in my image, are 6.5 inches x 5.5 inches X 1.5 inches.
Any body have thoughts or expertise?