Cable poncho - this is a retail item ~ two rectangles, stitch to desired arm opening ~ stitch to form shoulders leaving a collar opening. pick up stitches for generous rolled collar . co slightly loosely! Hmm think this is doable!
Garment inspiration: An interesting, sleeveless cowl knit tube top one could wear with either end of the tube "up." It even has a halter-wear iteration. While labeled a DIY, it's just this series of s (Diy Ropa Patrones)
From a Spanish site which can be translated but it is for crochet ~ hopefully will be able to work the schematics out for knitting ~ love the neckline and high buttoning. Make your own buttons ~ Instructions on my board, maker ~ button.