I don't remember which pattern I used for the Romano I made, but I know it came from McCall's. Check through the costume section of one of their pattern books, I know I used one that was for a military uniform of some kind, and modified it for all the pockets and such.
If you're going with cotton, pick a heavier one. Lighter cotton might look alright and be easier to wear in a Dallas summer, but the heavier, stiffer cotton will behave a little better when its worn. It will look more like a military uniform that way. I used bottom weight cotton twill, and though I felt like dying it looked great.
-Yin, Darker Than Black
-Yosuke, Persona 4