Tunic- Take Two

In order to better accommodate my voluptuous little girl, Phinny, I had to re-pattern the tunic I made. Arm-flapping room needed to be added, and neck room. If she's anything like me, she won't want a collar anywhere near her neck. Which, an oxymoron, yes.

It has the right proportions now, though it is a little big for the bunny.


Anyway, I have SeamStress! I can't figure out why this is happening, but after I wash things after sewing, the hems on both the bottom edge of the tunic and on the bottom edge of the lining keep flipping up and acting like an asshole. Does anyone know how to prevent this from happening? I'm worried you'll say something about like, fabric bias. Or grain. Either way, sounds complicated. But this happens on a lot of my stuff with this combination of heavy knit backed with a t-shirt fabric. Demons.