Warning: The following post contains pictures of me attempting to fit pants. Or pants-like things.
I've gotten the test version of the pants basted together, and spent some time this afternoon tweaking the fit. Here's how the process has gone so far:
Step 1: Added all of the markings that didn't happen in the original Frankenpattern. Which turned out to be way more of a trial and error than it should have, at least for the first piece, because I hadn't finished my first cup of tea for the day at the time and forgot that my seam allowances are currently 1" and not 5/8".
Then came the fun part: basting the whole thing together (sans pockets and facings and zipper fly bits) to see what the situation would be.
The main problem initially was, of course, the crotch. Lots of pulling and sagging and whatnot. I also had to take in a little bit on each side and at the top of the back to fix some gapping issues. It's still not perfect, but I think it's about as good as it'll get, at least with this fabric. It's a kind of stiff twill, so it just doesn't have much in the way of drape to hang well in the back. As for the front, there's still some creases, but I'm becoming convinced that pretty much any pair of fitted-at-the-top women's pants is going to do that, since it seems like, in my cursory glance over the internet just now, even skinny models with no hips have those wrinkles when they wear pants. (At least, in the initial Google image search, and on Anthropologie. On a side note, these pants aren't there anymore. So this has to work!)
Next step: I need to take these shorts apart again, since they're only basted together (though I think I'll trim the seam allowances down a bit first.) Then it'll be sewing them together for real, mainly to give myself a bit of practice on the two techniques that concern me in here: the welt pockets and the fly-front zipper!