The last 2 times I was called for jury duty, I wore what I wore for business casual days.
The first of those 2 times, in June, 1996, my company had recently introduced Casual Fridays for the summer, so I simply wore what I would have worn on those warm-weather Fridays - a nice, casual shirt I bought from Land's End and shoes and business slacks. I might have tucked in my shirt, something I didn't usually do at work.
The second of those 2 times, in October, 2007, business casual was the norm every day, so I once again wore what I had been wearing to work. Same for tucking my shirt.
But the very first time I was called for jury duty was in November, 1987. Back then, I had no business casual wardrobe. My nonwork clothes were not appropriate, I felt, for jury duty. So, I just ditched from my work outfit the tie and the sport jacket and wore my button-down shirt and nice pants and shoes.
All 3 times, I was paid full salary from my employer so they either deducted whatever small pay I got from the courts or I turned over the check to payroll. I was allowed to keep any travel expenses. I think my employer allowed whatever cents-per-mile they reimbursed for business travel which may or may not have been the same as what the courts paid me for.
I haven't been called again since 2007, 16 years ago. If they call me again, great. If they don't, that's fine, too.