I am having such a hard time figuring this out, and I can't find a reference for how to do it. I've only found one pattern for a drape neck, and the construction is quite different from what I want, in that this is really high up and just straight across and what-not:
I thought from looking at that that I could just increase a bunch, but in the top I'm making that just was not working. I tried short rows, this just made the world's largest boob holder. Looking at a store-bought drape neck I bought and seeing that the front got wider and longer at the top, I tried a top-down construction of knitting a wide panel first and decreasing and then CO the rem stitches for a raglan, but this just makes a weird flap. I also tried a similar thing from the bottom-up, just increasing a lot after the bust and then BO quickly, but no-go. Anyone have any ideas?