No one loves a good fashion deal more than us. I mean who can resist the siren call of a $20 H&M dress? Or the summer sale at Zara, for that matter? But while fast fashion seems awesome (trends right off the runway for all for the price of dinner), it could be coming at a serious cost to our planet, our culture, and ultimately, ourselves, as Elizabeth L. Cline warns in her new book Overdressed: The Shockingly High Cost of Cheap Fashion (Portfolio/Penguin, $25.95). The book has been likened to Fast Food Nation, but for cheap rompers and jeggings. At the risk of turning us off of our favorite in-a-bind fast fashion chains for good (sometimes you just have to see how the sausage gets made), we spoke with Cline about why fast fashion is so toxic, what will need to change in the fashion industry, and how you can help.