With every year comes an entire collection of fashion trends to get in on. With these, we're not talking your typical wardrobe essentials: We're talking about the items that will come to define the year; the ones that dominated the runways, trickled down to fast-fashion, and infiltrated store shelves across the globe. These are the trends that will have a lasting effect on the industry, meaning they're almost guaranteed to have staying power as time goes on.