The invitation says
"Beach Formal: Upscale casual to beach cocktail attire. Seersucker welcome."
Oh, and I'm pretty broke.
"Upscale casual" means the groom may or may not be wearing a navy blazer with khaki pants (see above), and the groomsmen may or may not be wearing socks.
The bridesmaids and/or female guests, I suspect, will mostly be strapless and beachy and boring. If you want to fit right in, feel free to buy a seersucker Lily Pulitzer.
Or, if you'd rather KNOCK IT OUT OF THE PARK, why don't you wear a sexy silk tank dress?
With killer wedges, obv.
1. Patterson J. Kincaid's aptly named Tie Dye Hamptons Tank Dress, on sale at shopbop
2. Carin Wester Naamah Tank Dress at Mohawk General Store
Top photo: Karen Wise Photography via Style Me Pretty