Quote - in uv window select one edge on waistband hit W (keyboard)

choose align (y or x depend which line you try)

then press P to pin it then unwrap again

if at first it wont work try again ;-)

or there some addons (but my fav dont work anymore boohoo)

 

hope that helps

It most definitely is, Hedd. Thanks! I still have to go back in and fix those seams, but if these align, that's all I need.