I'd think it depends largely on how "dressy" the firk looks and what "style" it is. If it's something like one of those canted-jeweled-pommeled Victorian-style monstrosities it just wouldn't "look right" with casual attire, and it would be way too anachronistic for something like a RenFaire.
On the other hand, if it's something like one of these incredibly fancy yet functional ones by Garth Duncan. . .I'd wear it for any kilted occasion, no matter how formal or casual. I'd wear it to work. I'd wear it to church. I'd buy it its own little blanky and bring it to bed with me at night.
"It's all the same to me, war or peace,
I'm killed in the war or hung during peace."
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