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Tim Gunn's Rules of Style
Amanda Hearst in Tulum, Mexico.
Top off Cecilia Prado's raw-material swimwear (bikini top & bottom, $85 each; neimanmarcus.com)...
Dress Code: Ashley Madekwe's Real Style
...with Mar y Sol's sustainably crafted chapeau ($85; shopmarysol.com).
Proceeds from Tommy Hilfiger's promise collection benefit relief work in Uganda (dress, $158; tommy.com).
Each piece in Olga Olsson's ethically minded (and locally sourced) swimwear collection is tied with a fita do bonfim &8212; a wish ribbon &8212; to make all your green dreams come true.
Bikini, $270; olgaolsson.com.
Regionally produced in Africa using local materials, Bantu's bathing suits celebrate the cultures of Zanzibar and Dakar (bikini, $160; bantuwax.com).
One-piece, $180 bantuwax.com
For a look as easy on the ocean as it is on the eyes, try La Isla swimwear &8212; each piece is handmade using organic cotton and soy-based dyes.
Swimsuit, $112.50; laislabrand.com.