I live and work in the Florida panhandle, and rarely find a gig that needs much more than casual attire. Even weddings around here tend to be casual affairs!

I honestly don't think I even know a local musician who owns a tuxedo! Tidy slacks and a comfortable shirt for indoors, shorts and tee for outside (it's a little hot for formal, here!) are the norm.

I guess it's always a case of fitting in with your customers, rather than some kind of preset dress code - we're not doctors and priests, after all....!
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An arranger is just a tool. What matters is what you build with it..!