These days it seems like all the struggling retailers are taking their strongest performing brands and spinning them out from the larger parent companies. J Crew plans to take its Madewell brand public, and Gap intends to spin out Old Navy. Why are so many companies choosing this path and what do investors need to know about these new concepts hitting the market?Stocks: GPS, URBN Check out more of our content here: TMF's podcast portal YouTube Twitter Join Our Motley Fool Podcast Facebook Group LinkedIn StockUp, The Motley Fool's weekly email newsletter