Well, outside his normal cosrume, there are always Guukan's dress robes.
Another DA repost.
Original comment:

Guukan: Will you have this dance with me?

A very infrequent occurance. Guukan, wearing his full robes, with his hair pulled back. Normally, he only wears the tunic layer of his robes, along with his cap, vest, and pants. Here, he's wearing the full ceremonial ensemble, overrobe, tunic, and underrobe. He's wearing a ceremonial topknot as well. He only does this at the American Kitsune Ball.
There is no background because I couldn't bring myself to draw one.