FR is also used in and around electrical installations, not just oil and gas.
When OSHA first started talking about FR, they were even talking about FR underwear. I voiced my opinion that if my underwear were on fire, I already had lots of other things on my mind.
EDIT TO SAY: It's all pretty much bullshit and just one more way to make us slaves pay ever more. Fucking government and those that bribe them. 3-10 washings and the flame resistant chemicals are gone. Stay with natural fibers, wool, starched cotton, silk or go with Nomex and you have the flame resistance for the life of the garment, barring any frayed edges and shit. My super heavy overcoat is the EXACT same item but has been chemically treated to resist flaming.
But, yeah, hard to beat...I disagree. LOTS of other clothing lines out there doing at least as good and probably better. Bulwark comes to mind immediately.
Fuck Carhartt and their vaccination stance. I'm going to go ahead and wear out the shit of theirs I already own but I will NEVER buy another piece and if I am given any, I will as politely as possible decline, no offense to the giver. Most of the vendors I deal with feel the same. No more Carhartt and no more Yeti and fuck Black Rifle Coffee, too.