Can a summer wardrobe be eco-chic and affordable? Yes, says Randy Brewer, owner Convert, a California-based boutique that offers a wide selection of sustainable apparel at high-street prices. Launched in 2010, the store was the veteran buyer’s response to the dearth of ethical, fashion-forward threads that didn’t leave a dent in your bank account. Response has been overwhelmingly positive, Brewer says;…