I think that the only way to get that ruffled look on the sleaves (like you see so often in WWII pics) is to get the jacket wet one way or the other. I have a G&B horse that is very soft but lacks the ruffled arms. I have hesitated getting it wet not knowing if the color might bleed through the jacket. Maybe the best thing would be to try a light mist first? Here goes nothing.
Ray
Ray