Swim Week on South Beach in Miami is mostly about glitz, glamour and leggy models traipsing about celebrity-lined runways.

But at one Friday night show at the Setai, it also was about trying to save the planet — one itty-bitty bikini at a time.

A group of “eco-couture” designers unveiled lines that eschew synthetic textiles like polyester. Instead, they’re crafting “sustainable” swimwear out of fabrics made from wood pulp, hemp and bamboo or from recycled plastic bottles, “upcycled” factory scraps of cotton and nylon and “repurposed” material like military parachutes.

Designer Linda Loudermilk said last week that she would debut what she billed as the world’s first fully compostable bathing suit.

It’s fashioned from a plant starch, she said, that has been turned into a fabric. She said the suit won’t dissolve on a woman’s body, but bury it under dirt, like in a landfill, and it would break down within 180 days — leaving not a single spandex strap, blot of chemical dye or foam bra cup insert behind.

“You can use it again or you can throw it away,” said Loudermilk, a pioneer of the eco-fashion movement. “It’s very inexpensive, so it’s something you can give to your guests but it has a fashion forward look.”

The show, dubbed Haute Natured (see www.hautenatured .com), featured Loudermilk’s “Luxury Eco” line as well as environmentally friendly designs from Eco Swim by Aqua Green, Meadow and MAE Couture.

Alas, another cutting-edge piece of apparel, the solar-powered bikini, did not make it to Miami, owing to a travel issue for the designer, show producer Ryan Hattaway said. Covered with flexible photo-voltaic strips, it is billed as being capable of recharging small devices yet is fully submersible — at least once the cellphone is unplugged.

Eco-couture has been around for years but is relatively new for women’s swim wear, typically constructed of man-made materials designed to dry quickly or hold shape. That often means they contain chemicals and are almost impervious to the forces of a compost heap. Polyester is made from the same stuff as many plastic bottles.

Using sustainable materials poses a lot of challenges, said Jenni Saylor, the designer for Eco Swim by Aqua Green. In fact, she thinks it’s impossible to make a suit that will appeal to women without at least a little spandex, aka Lycra, which helps a suit cling in the right places.

“Eco-cell” foam bra cups, made with biodegradable plant oil, are one of Eco Swim’s big features. The suits are made from recycled nylon, polyester and cotton.

Fabric isn’t picked from old clothes bins but comes fully processed and cleaned from manufacturers.

“It’s absolutely not recycled clothes,” she said. “A woman would be totally disgusted by that, especially when it’s touching your body that close.”

By definition that doesn’t amount to much material, so biodegradable bikinis aren’t going to make a big dent in the waste stream.

But the designers think wider adoption of the innovations could have a substantial effect. Saylor said the company is considering sharing its techniques.

“It’s not about us,” she said. “It’s about the environment.”

Both designers said eco-couture reflects a lifestyle choice and should appeal to women who, for instance, buy organic food and products.

“This is the new meaning of luxury,” Loudermilk said.

“How many Gucci glasses and Louis Vuitton bags and products can you have? The luxury eco movement is giving people a way to be proud of what they’re choosing to wear.”

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