Just about finished making a dress that has no zipper. Tried it on and the back is too tight. Is there anyway to make/add some type of inverted pleat to give me some room to move my arms without having to take it all apart and start over? I do have some material left, but not enough to make a complete second back to the dress. (The top and skirt of the dress are separate pieces that I haven’t connected yet.). HELP!!!