Help with patterns.

I have a pattern book which has a pull-out section. It's Japanese. I made my friend a shirt from the pattern and even though it was a size XL on the sheet, it came out at an 8-10.

It's huge, I think around an A0

Does anyone know how I can get it blown up? Obviously now I've made the shirt I can measure the waist and see by what percentage that needs to go up by to be a 14, but I have no idea how to get something this big copied and printed out.

Any suggestions? :)