You know that happens to me quiet often too the articulation with the clones or jedi. Usually the plastic on the star wars fig is to thick and doesnt allow for alot of range in motion I too am thinking of using soft goods to eliminate this problem great custom by the way!!
I run into this all the time. rubbery kama's, robe ends, or trenchcoats especially. Soft goods flow with the figure's poses much better.
I'm actually looking at using the iron man 2 nick fury's trench coat (which is soft goods) as a template to sew together my own soft goods trenchcoats... If they work good enough I hope to make them easy to re-create.