Okay, so first ,I'm going to back up some of the ideas expressed so far. Nipple rings, horn caps and musk all sound awesome.
For clothes, maybe something for a workout so he could help people in the gym or something. Though something more butler like would be cool and it would fit his role as a host in the hotel, or if the player is sticking with something from the early 19th century, a gentleman's set could also work. For accessories, I think horn rings could be interesting. They would add on to his charm while not getting stuck in cloth or being too much of a handicap. Simple earrings could be a nice addition and not mark him like cattle.
That's all I can think of atm. Good job on the game guys and I wish you the best! :D