Since neither pattern had a Peter Pan collar, which was Jess's favorite of the two designs, I just googled for a tutorial, and I ended up making my own pattern, which was pretty simple.
So that's how it all came together, and here, finally, is the result!
Jess was quite impressed that I even matched the print underneath the flaps. (Shhh... don't tell her, but I didn't actually plan that. Nice how it worked out, though, although I doubt she'll go around lifting the flaps for everyone to see! Ha!)
Of course you know how kids like to act silly when doing a photo shoot. My kid did, too: