Colette Patterns posts a tutorial on their blog, The Coletterie, showing how you can sew a vintage-inspired cropped sweater top. Sew, not knit. That makes my knitting-challenged self happy! Instead of knitting the sweater, you can sew it out of sweater knit fabric. They show it as a variation of their Moneta dress pattern, but this would work with any fitted bodice pattern intended for a stretch knit fabric. Go to The Coletterie for the tutorial.
[photo from The Coletterie]