Interesting that you noticed that. One of the traits of RGB (that will become more apparent as the story proceeds) is that, although he likes to give off a sense of class and sophistication, he’s a complete sham artist. He’s all about false impressions and selling something that isn’t there, illusions and pretty words. TPoH itself is riddled with the message that things are never what they seem.
So, he gives the impression that he has immaculate taste by wearing suspenders and spats, but if you look closley the fastenings are cheap, and the spats are actually just a part of his shoes- they aren’t the genuine article. Nothing about RGB is.