The pattern can be found in this booklet - Patons, Summer Breeze. It contains 8 crochet patterns, all of which are lovely, to be crocheted in DK or 4ply.
This is the vest I chose to do.
In a wonderful pistachio coloured 100% cotton yarn.
The design was really pretty, easy to do, and worked up surprisingly quickly considering it was a 4ply and a 2.5mm hook.
Slight issue that I was not concentrating when sewing it up, and sewed it up inside out. This means the pattern is a bit more pronounced on the inside rather than the out, but I don't think it will be too noticeable :) (I hope!!)
Starting on this one next, in a rich plummy colour to compliment the pale green of the vest.