I think the problem is the organza. Even though it is cut on bias, it still won't stretch like the knit does. I think I'm going to have to underline with a Tricot knit (which is typically used to line and underline knits), and then also have a facing for the yoke detail to hold up the beading. I got rid of the back yoke all together, so I'll just have beading on the front of the shirt. Yay for experimenting!