From what I have seen, Anakin Skywalker in Episode III wears a darker colored Jedi Robe. Other than that, it's really no different than the other Jedi robes from that movie if you look closely, just in a very dark brown or black. He didn't change in the whole movie, it's just the way he wore it - his hood was up towards the end to give him a darker, more ominous look as a Sith Lord. Underneath he wore a very dark tunic with dark leather tabards.
For the robe, and even the under robes, I would recommend Twin Roses. My friend and I bought from there, and I think the look of the robes will be perfect for what you're looking for - they use the Episode III style robe with the big hood, big sleeves etc. You can work with them and tell them what you want, and they will work it out with you until you're happy. Great customer service, great product quality overall.
www.twinrosesdesigns.com