I believe it’s a vintage 1990’s era Houston Oilers snap back hat. The team was briefly known in the mid-90s as the Tennessee Oilers, but are now known as the Tennessee Titans.
Julian Casablancas just wore the hat again on Conan tonight:
Where can you get mad swag like JC? Well the bad news is I’m pretty sure that baby blue is vintage, so you’re gonna have to go digging … or you could be the lucky one to nab what looks to be the identical style hat up for bid on eBay right now. Current price is $29.99.
I have no affiliation with the person selling the hat so I can’t confirm it’s the exact same one, but it sure looks like it.
Although… this one is all sorts of awesome too…