I'm finishing the underapron edge. I've halved and folded under the facing & now I need to match the stripes while skewing & stretching. It seems that no matter how much I skew & stretch, I'll never be able to overcome the laws of physics - it still wants to fold back and pucker up.

Is there a technique that the gurus amongst you use to overcome this frustrating task? I'm using a plain weave, and I can see at this point that a twill may have a bit more "give" and flex in it. Any advice/tricks/magic you can impart will be greatly appreciated. Cheers.