Originally, I thought I would cut the turtleneck, pick up the stitches then knit the 2-3 inches I need, but that gave me the willies. So rather than cut it right away I decided to run a needle through the stitches six rows above the ribbing, and knit down from there. I probably don't need that many but I wanted to give myself some room to cut and unravel. If I knit from the rib up I would have to kitchener a quarter of the way across the bust line. I thought that it may be neater to pick up the stitches there instead. With the sweater upside down I picked up the right side of each stitch then knit from there. (Sorry for the quality of the pix - the lighting sucks.)
I'm progressing on a yellow top I'm adapting from a design by Twinkle.
The bottom half that will just cover the bust is knit in Cartridge Belt Rib. I will crochet the top half. There's no pattern that I know of, I'm making it up as a I go along.
I swatched the Artfibers Rosetta in an 8x8" swatch as Sahara suggested. I'm using linen stitch.
Have a happy and safe 4th!