For a causal beach wedding dress, you may want to avoid heavier materials like brocade, velvet, and heavy silks. Instead, many brides opt for lighter, flowing fabrics that drape well and are less prone to wrinkling. Fabrics such as the following may work well for beach weddings:

Crepe: A thin delicate fabric with a creased or crinkled appearance.
Charmeuse: A soft, light fabric with a slight sheen.
Duchesse Satin: A light blend of rayon and silk, a great alternative to heavier satins.
Damask: A woven fabric that has the look of brocade without the weight.
Chiffon, Batiste, and Illusion Nets: These fabrics are lightweight and can be layered for very feminine looks.
If you are opting for a fall wedding when the weather is cooler, slightly heavier fabrics are more appropriate. Whatever material you choose, it should be breathable, have a texture you like, and be comfortable enough that you can relax in it during your wedding and reception.

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Yesterday I visited many sites for buying my summer wear. I got one good site. Here are also many exotic forms of micro bikinis and many different designs. Some have multiple strap designs and jewels embedded in them. The tops come in either diamond shape or teardrop shape as well.

I think white is a general choice for a beach wedding. Gowns for beach weddings are usually not very colorful. Some priests do not allow showing too many skins, but you can compromise with that by using shawls and just remove it for the wedding party. Prom Dress

A destination wedding dress is most appropriate however, I got married on the beach and I wore a mermaid wedding gown with a chapel train. It was taffeta so it was a lighter and cooler material. Most importantly you want to love your gown and not be extremely hot. But, brides today have their wedding their way. It's the only day you can have your cake and eat it too!