By now you've probably flipped through the fall fashion books, and made your way to a bikram yoga class to work out all the kinks in your back and shoulders that tend to afflict persons carrying an extra 21 pounds — because that's how much weight you were lugging around if you picked up the September issues of Allure thru W. (For what it's worth, it's lighter than last year's load.) The crowning jewel of the heavy mags was, of course, Vogue, whose 798 pages weighed in at a whopping 3.74 pounds. [Folio] It's just Anna Wintour's way of telling this year's runway models how much weight they have to lose if they plan on walking in this season's shows.