How much fabric (cotton) does it take to make a men's shirt?

I am looking to get a collared shirt created and I am wondering how many square feet it would take (roughly) to get a men's collared shirt made? I am 6'2 220 with long arms... I typically take a L or XL shirt. How much fabric would I need (I'd rather have a lot more fabric than too little)... please... show more I am looking to get a collared shirt created and I am wondering how many square feet it would take (roughly) to get a men's collared shirt made? I am 6'2 220 with long arms... I typically take a L or XL shirt. How much fabric would I need (I'd rather have a lot more fabric than too little)... please help me!!
Update: P.S. I mean a long-sleeved shirt made out of cotton.
Update 2: I realize I might need 100% of the fabric... but how many square feet?
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