I did some research and found this brand/store that is right here in NYC that bases shirts on bra size, which is an excellent idea. However, they only start at a 32 band and only go up to a DD. I have some hope, though. I don't measure out to the 30FF that I am, more like a 32D, so there is a chance I might fit in a 32D or 32DD shirt. Unfortunately their shirts are very pricey, but certainly worth the cost if they fit. I might go there in person when I have the money, but I thought I would share my find for the other busties on the forum:
http://www.rebeccaanddrew.com/index.asp
They also tailor their shirts to fit different shapes (broader shoulders, straighter torso or curvier torso and softer shoulders), and they come in different lengths. if they offered free alterations, I would officially say I hit the jackpot. For now my assessment is optimistic but guarded.