Description from Knitty.com:
Summer time and the living is breezy in this sleeveless shell with built-in ventilation! The top is knit in the round to the arm openings, then divided for the front and back which are knitted flat on circular needles. The simple lace stitch uses common decreases and YOs. The shoulder straps can be joined by kitchener stitching, 3-needle bind-off or sewing bound off stitches together. Your choice!