Love the cap, not sure about it with the black stewart. Looks like they MIGHT fight each other, but as others have mentioned, the separation might make it a non-issue.

However, I have found that while a hat, or any other accessories, worn with trousers will be ignored, people look much more closely at how I accessorize when I wear the kilt. Maybe because they aren't sure what goes together (neither am I, but I don't tell them that!) and are using what I wear as a way to find out.