Models have to learn how to change into new ensembles multiple times during a single runway show, but one famous eco-model has signed up to wear a single dress for a month. Summer Rayne Oakes will be donning the same LBD for 31 days as part of a bid to raise $10,000 for charity:water.

Her eco-fashion challenge is part of The Uniform Project, a minimalist style initiative started in 2009 by Sheena Matheiken, who wore a single dress for a entire year. Now for 2011, The Uniform Project is bringing on one eco-fashionista a month to show just how multifunctional and reusable a single piece of clothing can be by rearranging and reaccessorizing one basic dress — while raising money for a good cause.

This month, that fashionista is Oakes — and she’s already created some remarkably different looks from a single '50s-inspired dress she designed with Terri and Sandy of Carasan Designs. Made with silk, hemp, and organic cotton, the eco-friendly dress will soon be available for sale on The Uniform Project’s website.

In the meantime, you can check out her blog, with photos of each day’s outfit — and donate to charity:water while there. Any money you donate will be doubled by Payless ShoeSource, which will match donations dollar-for-dollar — up to $10,000. Plus, there are fashion incentives for donators. Send $10, and you’ll get a coupon for 50 percent off Payless’ greener footwear line, zoe&zac. Send $50 or more, and you’ll be entered into a drawing to win a signed copy of Oakes’s book “Style, Naturally,” as well as other eco-fashionable items.

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