As far as colours, it seems like a medium sky blue t-shirt, dark greenish/olive pants and a dull rust-coloured jacket tied around his waist.
You could probably find that stuff at a thrift store if you're lucky. If you can't find a t-shirt the right colour, just buy a plain cotton one from Wal-Mart or something and dye it.
I'm going to be helping my boyfriend put this costume together, so I need to look into it more, too. n_n;