Home of the Sovereign Protectors

Yes that second 2" belt will be the one your looking for.

Great, I just wasnt sure with how it looked like it had holes on it

If you are in the San Francisco/San Bruno, CA, USA location I'll host a class at the store on it if you're interested.
Edit: just caught this was posted a few months back. Offer stands.

LuciousTalvloinne wrote:The only difference in the hides is one has been dyed for you. You will need 2 inch width then cut in grooves on top and bottom to replicate the costume. The buckle you will need to have the 2 inch size.

What tool would you suggest to use to cut the grooves?

Sitching Groover is the tool you are looking for. That will give the best consistent groove because it has a "fense" of sort to keep the groove a set distance from the edge. Leather craft stores will carry these. There is sometimes a larger or smaller groover, the one I used cuts about a 3/32-ish channel.

Alternatives I've seen:
V-gouges - the leather craft tool or the wood turning variety, used to varying success as there's no fense on this tool which can lead to regrettable slips.
Marking gauge or wing divider - wordworking tool and geometry tool, typically a nail embedded in the gauge or at an end of the divider arm can be dulled and used to crease a line in the leather (best results with veg-tan leather).