Fall weather is all about layers. You strike out from your apartment at 8:30 a.m. and a jacket and scarf is required. By the afternoon, you're glistening as you run to your next appointment. By the time you leave dinner, you're shivering again. Layers can also be useful for toning down that crop top. So during the day you've got a hint of spice. By night, you're heating up the dance floor. Take a look:Remember kids, crops tops only go with high-waisted pants. Britney might be trying to stage a comeback, but her 90s style is not.