Giant belly plus lightweight doll makes for a pretty poor test but I think this thing'll work. If not, it was all knit fabric from my stash and only took about 30 minutes (after 90 minutes of fighting with the serger) so not a big loss either way.
In unrelated news it's pouring rain here. Totally bizarre for late May in Sacramento. And we just had 5 yards of crushed rock delivered to our driveway. I'm glad I have an excuse not to shovel all that rock!