One person is saying it. I'm saying that that person is mistaken. Looks great to me, though you need to show more cuff. Looks like the suit sleeves are in the right place, but the shirt is a little short. That's a nitpick though, it looks like that outfit fits you very well.
I said "Blues Brothers", not "Brooks Brothers". And I don't think most American schools have uniforms. English ones do. When I was at school, mine like many others involved a black blazer.
And like I also said, I misread the OP that he only had a black suit and needed to wear this tie with it. I have had a few black suits too. But like you said, never as the only one.
Keep calm. x
Sorry, did misread the blues brothers bit, but you don't get that association without the narrow black tie and the fedora. At that point, you're running into all sorts of stereotypes, you could also go with Men in Black, or wanna be secret agent. But without the black tie, you don't run into that territory at all.
As for the school thing, even if your blazer was black, suits and blazers create very different outfits.
I really just hate all these people dragging out specific connotations attached to marginally related outfits. Classic Menswear is all very similar, and there's always going to be some idiot who associates any suit with evil people, or the color navy with a parent who beat them, or all odd jackets with the blazers they were forced to wear at school. The whole point of classic menswear is that it can go across a huge number of settings, and when you associate something like a black suit with any one thing, it becomes an exercise in ridiculousness. Because while a black suit (in this case, not even a black suit, just a black something) might be worn in that context, it's also worn in a thousand other contexts as a perfectly normal matter.
It's a dark, conservative suit, useful for those who like high contrast and high saturation looks. High contrast and high saturation is not always the favored aesthetic around here, but that does not make it a bad one. Beyond that, specific associations are really kind of pointless. It just sounds like the people who say things like, "my grandfather wore wingtips, so therefore they're only worn by old people". If you want to use that to guide your own style, whatever. But it's a horrendous basis for giving advice to other people.