It would help if you posted a reference photo. Please don't assume that everyone knows the character, or that they'll go do the work to look up your character for you.
There's an "Introduction to pattern" tutorial stickied at the top of the sewing/fabric craft forum. It's a good place to start. It provides the websites to the most common commercial pattern-makers in the US; they have most of their pattern catalogs online that you can browse to find what you are looking for.
Nearly every commercially-available pattern comes with a description of how much material is needed to make the garment. If you don't have a pattern yet, how did you know how much fabric to buy? If you're lucky, you over-bought, and have way more material than you need. If you're not lucky, you under-bought, and you'll come up short on material requirements. In that case, cross your fingers that you can get more of the exact same material - otherwise, it won't match.
Pictures and tutorials from my costuming portfolio at Syagria's Cosplay Site!
Star Trek Original Series Uniform!
Original Creation for AB13
Most Recent Con:
PAX East, Anime Boston 2013