I am sorry, dear readers, it seems that I am cruel enough to subject you to mirror pictures of my butt. I've been trying to fiddle with the fit even though I haven't figured out the waistband yet. I'm thinking I should have used the curvy pieces instead of the regular pieces.. but it's hard to tell. While my butt isn't so flat as it seemed to be before I had any clues about how pants were supposed to fit, it's not my butt that's a fitting issue, it's my thighs. What I'm getting is those diagonal wrinkles in the back from crotch to hips. And some bagginess in the front. Of course, maybe I'm a total idiot for trying to do any fitting before figuring out the issues with the yoke.
I think what I have to do is extend lengthen the crotch curve such that there is more room in the thighs. I'll probably need to cut out entirely new pieces to get it right. I let out the side seams, which helped some, but that may just be because they're looser. I think what I really need is more room in the inner thighs.. it seems logical, anyway.
I started a WIP on PR for the pattern, and when I didn't get any suggestions through that, I started a thread. I got some good, logical suggestions.. or rather, suggestions that would be logical if not for the pattern. Mainly, that perhaps the pieces weren't meant to be the right size and needed to be eased in. But the notches and stay-stitching make that unlikely.
Here's a picture of the front left yoke, from both sides. With the notches lined up, the side of the yoke meets the side of the front of the pants correctly. So all of that easing would have to be happening within those four inches from notch to edge-- no way can I get a whole seam allowance by stretching non-stretch fabric over a four-inch seam.
As for the back, I think any chance of easing-in intent on the part of the drafter would have been nixed by the instruction to stay-stitch the top edge. If I was supposed to stretch it out to make the pieces fit, that would make the instruction to stay-stitch that edge to prevent stretching utterly nonsensical, right?