I ordered similar pairs of straight-leg jeans from Old Navy, Banana Republic, and Gap.Karen Santos for BIThe recipe for most fall outfits starts with a good pair of jeans.High-quality denim lasts for years and can be styled again and again with whatever the next season calls for. And although trends come and go, no fit is more versatile or reliable than a standard straight-leg jean.I was overdue for a new pair, so I turned to Gap, Banana Republi…