I've never really been that wild about getting every splotch and stripe to scale... The only places where a camo-pattern is easily recogizable is the long/wide, flat areas of the thigh, calf, upper arm, and back. The chest area can be, if the figure's more or less at attention, or something similarly "stationary" and without web gear, mag pouches, and such, while the back of the thigh, the shin, sides of the torso, are usually in shadow or deep shadow in "action" poses, and the arse isn't an issue either, since the fabric's pattern is disrupted there anyway by the cut of the cloth during manufacture, especially those uniforms with re-enforced areas in that location, which is the case with pretty much all combat uniforms since the 60s... Also, for soldiers in the field, the arse-end is usually the same color as the local ground, lol...
I stay away from trying to paint a uniform exactly "in pattern" over-all... I just concentrate on getting it right where it'll show to the viewer, and then only what shows after all the gear is on the figure...
Your mileage may vary..