Some ideas:
● A casual maxi dress or a kaftan
● A casual cotton skirt (perhaps wraparound, or pareo) or cotton crops
● A casual, but romantic cotton blouse or a simple tank top
● Espadrilles or canvas sneakers
● If you need a topper over your sleeveless dress or top: a big white button-front shirt
● Straw hat
● Purse materials: straw, cotton (perhaps quilted), or macrame
● Sunglasses
● Colours: beige, blue, torquoise, sea green, white, light grey, sun-bleached shades
● Prints and patterns: Stripes, shells, sea stars, boats, sails, waves, seabirds, suns, clouds, palms, parasols, sunglasses, ice cream ...
● Jewellery:
● Shells
● Pearls worn in a casual way, like tiny ones in twisted beads or one chunky one worn as a pendant necklace
● Turquoises
● Amber
● Glass
● Motifs like fishes, sea stars and shells