"bizarre outfit" is a correct and usable phrase in written English.
You could use it in any context when describing an outfit that is strange or unusual in some way. For example, "She was wearing an incredibly bizarre outfit, consisting of bright yellow pants and a polka dot shirt."
Compare Uncle Sam's stern demeanor to his bizarre outfit, and you'll see what I mean.
Again she appeared in a bizarre outfit, an indescribable thing of fauxluxury fabrics, red and midnight blue.
A bizarre outfit or a strange conversation, an unfamiliar gesture or anything, really, that doesn't fit into the realm of acceptable behavior.
It is wearing this bizarre outfit that he first appears, addressing an anti-drugs conference sponsored by the New Path pharmaceutical corporation, which has an exclusive, lucrative contract with the government to supply detox and rehab services.
It is wearing this bizarre outfit that we first see him addressing a war-on-drugs conference, sponsored by the New Path pharmaceutical corporation, specialising in detox techniques - and like, all corporations in the movies, there is something very dodgy about it.
(In it, I said that, since I'd never seen Alice read a fashion magazine, the fact that she was able to answer in detail when I asked her about someone's bizarre outfit always stunned me, "as if I had idly wondered out loud about the meaning of some inscription on some ruin in Oaxaca and she had responded by translating fluently from the Toltec").
He wears bizarre outfits.
Undeniably she cuts a fine figure, in increasingly bizarre outfits.
Her eccentric style and sometimes bizarre outfits are an extension of that experiment, she said.
Isaac Mizrahi, usually a superb ballet costumer, supplied the bizarre outfits, layered things of bras and tights and tarlatans and God knows what.
Freaky fakeness on the outside — bouffant hairdos, gigantic shoes, bizarre outfits — is now interpreted as a sign of strength and realness on the inside.
