This was started at the back of the shoulder straps, each strap was knitted following a stitch pattern (see below, two straps on one long straight needle at once to make them identical). Once the straps were the right length, I chain crocheted under the arm holes and across the chest and back (periodically holding it up to myself make sure it was the right size). Some crochet was also added to one end of the straps for more front decoration. Then a circular knitting needle was put through all the crochet loops and up I went in a tube. The first few rows were seed stitch to prevent curling. The whole shirt area was stockinette so I could do it while watching tv, (with some increases and decreases added under the arms for the bust area). Once the tube was long enough a more seed stitch was added at the end to prevent curling, then a row of diamonds made using purls (start with a purl every 8th stitch, then move the purls in and out on following rows to make a diamond shape. This only partially worked, it curls up a little at the diamond rows.
Yarn is Cascade 220 Yarn, Neon Yellow and Shrimp.
Shoulder strap stitch chart is from: The New Knitting Stitch Library. Lesley Stanfield. Quarto Publishing, 1992. Chart #230, pg. 138.