I have some decent suits from pre-sf. Mostly SFA. Got quite a few Thomas Pink ties that are far from awful (a bit too suit-y for what I wear these days though).
And I think it's possible...though very, very challenging, to wear a suit jacket as a blazer. I mean, I could cheat in that one because I happen to have something which is very much an odd jacket (brown tweed herringbone, 3 patch pockets) that I also had pants made for...so technically a suit. But that would be, I think, a violation of the spirit of that hypothetical challenge.
Given that Bastille Day, July 4th, and some sort of Korean national holiday are all coming up soon, I think the Patriot Challenge might be a good one.
Hmm... This could work.
Warning: Spoiler! (Click to show)