Yes we will be at a beach resort. No we are not getting married on the beach. Ceremony will be outdoors and the rest of the night is indoors. Wear what you would normally wear to any other wedding. Please do not wear cargo shorts, t shirts, flip flops or sneakers. There is no specific color schemes. No it does not have to be linen. Here's some ideas if you are unsure...
My Lovely Ladies: DO NOT WEAR A WHITE DRESS and don't look like a hoe. Wear any other color or print you'd like. If you're someone worried about looking like the bridal party then stay away from Mauve. Opt for a nice tea length sundress, maxi dress, cocktail dress, romper/jumpsuit, slacks with a nice top/blouse, dressy sandals, heels, wedges or nice flats.
Fellas: How about Polos, Collared shirts (short sleeve or long sleeve), blazer, Slacks, Chinos, nice jeans without rips, dress shoes, boat shoe, loafer, dressy sandals.
At the end of the day please use your best judgement. I really just want you to feel good, be comfortable to dance and look good enough for pictures.