Celebrity Celebrity Moms Olivia Wilde On Why She Won't Wear a Jumpsuit to a Concert: "You're Gonna End Up Naked in a Porta Potty" By InStyle Editors InStyle Editors Facebook Instagram Twitter Our editors and writers comprise decades of expertise across the beauty, fashion, lifestyle and wellness spaces in print and digital. We prioritize journalistic integrity, factual accuracy, and also having fun with every story we share. InStyle's editorial guidelines Published on September 22, 2014 @ 01:06PM Pin Share Tweet Email Photo: Larry Busacca/Getty Images When it comes to music festival fashion, Olivia Wilde discovered wearing certain things can be a recipe for disaster. The actress and activist visited the Global Citizen Festival Pop-Up Shop in New York City, which she curated with her own company Conscious Commerce with business partner Barbara Burchfield, before the Global Citizen Festival on Sept. 27, where Jay Z, No Doubt, and Carrie Underwood will perform in Central Park. At the event, Wilde told InStyle that while she adored a recycled denim jumpsuit from H&M’s Conscious Collection for sale in the store, it wouldn’t be best for the fest. "I love this jumpsuit but if you go to a music festival and wear a jumpsuit, you’re gonna end up naked in a Porta Potty, and that’s something I’ve learned," she explains. But the Global Citizen Festival, which aims to end extreme poverty by 2030, is about much more than fashion. "This festival is very special because not only is it a really neat destination and an awesome event but it represents something so wonderful and positive and you can wear all these items that really send the message that you’re a part of the movement—you’re not just here for the music." Unlike Coachella and Lollapalooza, the Global Citizen Festival is completely free to attend. Tickets are given to those who earn points by participating in philanthropic efforts, such as signing petitions and buying the IMPACK, a kit Olivia’s company created, featuring a T-shirt, bracelets and more, with all net proceeds going to support the elimination of extreme poverty. The fresh-faced star, casually clad in a Global Citizen T-shirt, H&M jeans, and sneakers, says welcoming her first child with Jason Sudeikis hasn’t changed her laid-back style. "I wear more sneakers than heels at this point, which isn't a bad thing. I think one of the reasons women are nervous about becoming mothers is they imagine that they’re suddenly going to dress like their worst nightmare, but you don’t have to," she says. "Even maternity wear is really cool now. There’s nothing bad about having a baby when it comes to fashion or anything else. I’m a big proponent—I want everyone to procreate now!" For more, check out Olivia Wilde's best looks in the gallery.