This pattern can be found on pages 124-129 of Knitting Green: Conversations and Planet-Friendly Projects, by Ann Budd with contributions from some of the knitwear industry's leading designers.
Sprout, a 100 percent organic cotton yarn with a pleasing pebbly texture, is on the bulky end of Classic Elite Yarn's Verde (that's "green" in Italian) line. Pam Allen used this yarn to advantage in her swingy summer top that features a diagonal stitch pattern, deep V-neck, and drawstring detail. Pam worked the body in the round to the armholes, then worked the back and front separately to the shoulders, incorporating the neck and armhole edging along the way. Sew the shoulder seams and you're done!