Warning: if you're the sort of person who is a sartorial nit-picker, trolling the internet looking for evidence of someone having broken some inconsequential minutiae in a hardbound book of rules of dress that no longer exists just so you can inflate a false sense of superiority by leaving mean spirited and uptight anonymous comments, look away! What follows may cause health problems:
I'm not writing this to either praise or malign this unusual combination. Truth be told, I think it's pretty silly looking, but who cares? I don't find any more enjoyment in trashing specific examples of other peoples stylistic chance taking than I do in wallowing in a strict adherence to rules.
The clothing we wear is fraught with meaning. Many people don't realize it, but whether you wear a tux or pyjamas tells things to the world. Dressing well is a sign of respect for those you will deal with in a given day. It should also make you feel and behave better. Above all, it should be fun. If it's all about torture and anguish, what's the point?