I do not have a gauge for this pattern but I do tend to crochet a little more tightly than most. You want the tunic to be loose since it is open-weave and needs to be worn over another top.
You will need: D-3 (3.25mm) hook (2) Fine yarn - I used Lion Brand Glitterspun
Stitches you need to know: Single crochet double crochet
I adapted this pattern from a Free Crochet Pattern from Lion Brand. The original pattern is called the Crochet Bronze Beauty Top and you can find it here: http://www.lionbrand.com/patterns/40028AD.html?noImages=. It is for adults and comes in sizes: Small, Medium, Large, 1X.
Pattern is written in US standard terms.
This pattern was tested but you can always contact me if you have any problems with the pattern. I am happy to help if you have any questions!