Check this guy's thread out. It's the best design I've seen yet.
Make sure to check pages 1 and 2.
Also, keep in mind this is the Armor of Altair version of the hood. The difference between this and others is the lapel connected to the hood. In all the other versions (besides the Armor of Brutus) the hood is connected directly to the doublet - so it's just like a sleeveless hoodie. The lapels on those versions are from an undershirt if I'm not mistaken.
Here's a good reference to what I'm talking about.