I asked Tony the same question several months ago, but he's been busy with a lot of other projects, so unfortunately I don't think this is going to happen any time soon. I picked up three of these figures in anticipation of getting the red, blue and green tunics from him. I hope he eventually does make them. Otherwise I'll be stuck with three green Links on display or will have to ask someone else to make me some custom tunics, which I would really rather not do after waiting this long for Tony's work.
Maybe if more people expressed interest, Tony would start working on the custom tunics? I'd imagine the pattern would be the same as the stock tunic. It'd really just be a matter of finding the correct fabric, right?