I think that the important thing with the Doctor is the in the attitude. So I think that you can probably pull of 10 or 11 if you have the right swagger...and possibly a fez if you're going to be 11. I don't think how you look is going to be a deal breaker.
Or be like James Bond. Roger Moore didn't look like Sean Connery. Daniel Craig doesn't look like either of them. Go your own way.