When I was growing up, mismatching was NOT an option. Wearing Nike socks with Adidas sneakers was a violation of the eleventh commandment. Polo boots with a Tommy Hilfiger shirt would get you brought up on charges. Ohhhhh, but how time brings about a change.
While I’m still not a fan of logo mismatching, one way to mismatch and still remain lawful is with blazer and pocket square combinations! See below examples: