The easiest way to get the yarn for this tunic is to purchase the Lazy Days Kits. These come in 14 colors which can be viewed here:

http://www.artyarns.com/patterns/lazy-days-kit/
Errata: Circular needles ARE REQUIRED to make this design.

The Small, Medium, Large sizes use 2 kits, and the XLarge uses 3 kits.

This pattern has been tested, and you can review the test knitter photos and comments here:
http://www.ravelry.com/discuss/artyarns-knitalongs-and-designs/3442343/1-25

It is a very unusual design and is quite lovely and figure flattering.

The pattern is completely free of charge when you purchase the kits to make it. Here is a list of online re-sellers who are offering it:
http://www.fabulousyarn.com/artyarns_lazydaysofsummer-tunic.shtml
http://store.latelier.com/StrongLazy-Days-Tunicstrong-_p_961.html
http://www.monttricot.ca/catalog/7309871/lazy-days-kit