It may be fall—and that ushers in a whole host of new trends every year, without fail—but it doesn’t actually mean you need a whole new wardrobe.You see, fashion is actually one season ahead of the rest of us, which means all the hottest looks for spring 2012 just sashayed down the runways.So we snuck a peek, did a little fashion math and—just as we did in our picked out styles that will go the distance, making them great investments for more than one season. Below you’ll see our Venn diagram of what’s hot for fall, what’s cool for spring and the nine trends with staying power.Better yet, we broke down how to wear each, depending on the season. Read on.It’s a good thing we advocated for orange in your spring shopping list, because it’s back again for another season. Wear it with your fall plaids, and then freshen it up with nudes and neutrals for