This is a very simple, beginner-friendly project that knits up fairly quickly thanks to the lack of sleeves, but makes for a cute, versatile top with lots of layering potential. It's worked in the round from the bottom up until you reach the underarms, at which point you'll bind off roughly half of your stitches and work the rest of the front and the collar flat.
As simple as it is, this is the first time I've written a knitting pattern that anyone other than myself has to try to follow, so please let me know if any of my instructions are unclear! I'll do my best to clarify. I'll also include more photos at the end of the post, for reference's sake.
Note: this pattern was designed for a doll with a 19cm bust, 12.8cm waist, and 21cm hip measurement. The ribbing makes it fairly stretchy so it'll likely fit other similarly-sized dolls well, but you may need to make adjustments depending on your doll's proportions.