Well worth a look - within a couple of minutes of starting to walk north up Via Duomo, you'll be suspecting that weddings are a seriously big deal in Naples. I've never seen such a large number and wide variety of wedding dresses in one place anywhere - there must be 20 or 30 shops, ranging from simple and elegant styles to "push the boat out and get every bead in a 10-mile radius on it, you only get to do this once"!
If you're in the area, especially if you're looking for inspiration "just in case" (oh come on, all women are - you never know when you might need the perfect wedding dress!!), this is an interesting stop. Oh, and you can pop in on the cathedral while you're at it, which isn't too shabby either!