"I've been working on a couple of period films, so I'm a fifties and sixties fanatic right now," said Jennifer Lopez of the influences behind her latest Sweetface collection. The multihyphenate star scaled way, way back from her MTV-ready runway debut of a year ago to present her new fall line in the comparably intimate confines of Industria Studios. The better to see how it's changed, she suggested in her opening remarks. Yes, there's still a heavy street influencethis came across most clearly in the models' inch-long pearly press-on nailsbut the line is much more trend-friendly now. Volume, bows, waist-cinching beltsSweetface has them all. The first two came together beautifully in a floppy navy trench that a few insiders may think looks Burberry-esque. With J. Lo's imprimatur, fashion outsidersi.e., pretty much the entire populationwill think it's the very definition of cool.