The pattern can be found in the book Knitting Nature.
I started this in July 2007 I am using South West Trading company' bamboo. I changed the pattern some what, I added 1/2 hexagons to the bottom front and back. I just didn't want my 40 something year old belly button exposed. I did not add the half hexagon to the back. I added a few rows of garter stitch to the bottom to make it look finished. Though pretty it took too long to knit for my tastes. There are other tank tops that will be completed faster.