It will be a Cottagecore/ LoveShackFancy theme (think flowy fabrics and soft-pastel colors, summer suits/linen pants) on the island and the ceremony will be outdoors near the ocean. The link below has some guidance and ideas as well. Please no shorts and wear comfy shoes.

HTTPS://WWW.LIFESAVVY.COM/2599/DRESS-CODE-GUIDE-WHAT-DOES-BEACH-FORMAL-MEAN/