One week it’s on the runways in Paris, the next week it’s in the windows of Barneys. This is where well-heeled New Yorkers buy their, well, heels . . . and suits and sweaters and other items of apparel, all at outrageous prices. Who knew a pair of shoes could serve as the down payment on a car? Tip: Barneys hosts a warehouse sale in Chelsea twice a year, featuring discounts of 50% to 80% off the original retail prices. Check the website for sale dates—and arrive early.