The second law of thermodynamics and the first law of Nelly lyrics hold that ambient heat and clothing have an inverse relationship. Disturb the natural order with today's Groupon: for $29, you get $60 worth of designer consignment apparel from Mosh Posh on South Howard Avenue.

Mosh Posh, an upscale consignment boutique, carries exclusively current, fashionable, designer-brand clothing and accessories. The ever-changing jeans, dresses, shoes, tops, jewelry, and purses stocked in-store send knockoffs running for cover—all items are 100% authentic, and big names such as Gucci, Jimmy Choo, Marc Jacobs, Burberry, Chanel, and 7 for All Mankind steal the limelight, refusing to mix with the likes of mall brands. Nab a Theory button-down blouse ($50), or a pair of William Rast Birdie Boy Shorts ($45) to name-brand gams this summer. Chic citizens can preppify with a long-sleeve Lacoste polo ($50), toss on an Elan USA Tie Dye Maxi Dress ($49.99), or sling a Coach hobo bag ($139.95) casually across a shoulder, causing other women to experience the little-documented "purse-frenzies."