Kit Harris and the N’awlins D’awlins Baby Dolls will join Gregg Stafford and His Young Tuxedo Jazz Band in the Economy Hall Trent on Sunday, May 8, at 1:40 p.m.

For most visitors to Jazz Fest, the requisite attire consists of a T-shirt, shorts and sandals—or rubber boots if it’s muddy. If you spot longtime festgoer Kit Harris in Economy Hall, a stage devoted to traditional jazz, expect to find her in a far more...