The Groomsmen usually wears matching color Guayabera or Mexican wedding shirts of that of the bridesmaids dress color. Bridesmaids can wear light to pastel colors dresses with a simple style, sometimes matching the groomsmen shirts. This is done to have a more color coordinated and contrast style wedding.
It all depends on the style of wedding the bride has chosen. Fun, Tropical, Sweet, Elegant or Simple style theme will give your wedding attire a guideline. Fun, you can choose vivid tropical bold colors. Tropical you can have Hawaiian or flowery prints. For a sweet look you can have pastel colors. Elegant has more of a monochromatic look and it will always have a more elegant feel. Simple, just have the Groom in white or beige with trousers or jeans; the bride a spaghetti strap A-line mid calve dress with a flower hairpiece, and the bridesmaids in different strapless dress style with the same pastel colors to match the groomsmen. The ring bearer will also wear the same color shirt or outfit as the groomsmen. Flower girl will always look sweet in a long or short dress a little darker than that of the bridesmaids with some little flowers in her hair.
For a more detail information of the Bride and Groom, please refer to the information regarding the clothing attire for destination and beach weddings.