I made that pattern a few years ago for a swap when we were still on Deadster. I will warn you that this pattern really only works well for slender individuals. If you have any curves, it’s not very flattering, and doesn’t fit well. She gave directions for larger sizes, but they were based on math, just adding a prescribed number of stitches for each new size, but then she didn’t tweak that for fitting on a human body. Many of us curvy folks have more hips & butt, so sizing up around the hip line is needed. But just because we have a booty, doesn’t mean we have giant linebacker shoulders too, so we don’t really need that same size extension up top. If I had left it as she had the pattern written, it would have fit like an adult trying to get out of a child’s life vest. Sort of hugging around the back, ending on the sides, and stretched (or not reaching) across the front.
Since the swap recipient was pretty close to my size, I was able to do some adjusting to the pattern. If you’re in the same boat, here’s a link to my project on Ravelry, where I explain what I did to adjust the fit.