Hmm, I've made wedding dresses before, but for that style, you'd need a fitting to be certain it'd hang right. Pale green? Since you're talking beach, look at georgette and chiffon weight, and line it, should be plenty on shelves since we're in spring.
If you absloutely can't find what you want, come back and let me know.
If you absloutely can't find what you want, come back and let me know.