I don't know if water will work, but it's worth a try. It looks like they've tried to stitch the cape shoulders to fit/match the contour of the armour underneath. It's just bizarre.No way to flatten the cape on the shoulders? Even water treatment?
TESB and R1 capes are way nicer, but the collar is inaccurate to ROTJ and will need to be modified.
Maybe JAXON will make some better capes if he gets the numbers.