The first garment I've knitted without a pattern!
I used about 3.5 balls of Wendy Supreme Cotton DK in "lilac" on US4/3.5mm circular needles. It's basically a bottom-up, seamless raglan with the sleeve construction modified to be "buttoned up." The button bands were picked up and knit in 2x2 ribbing along the length the of sleeves and neck.
More details on the construction can be found on my blog