NEW YORK — For Oscar de la Renta, it’s a homecoming of sorts. His accessories production was brought in-house for the fall collection. “This is a departure for us,” de la Renta says of his “exciting plunge into a new market.” Long a mix-master of rich materials, eclectic prints and delicate beadwork, he’s showing classic handbags, shoes and evening pieces in leather and crocodile with exquisite embroidery and glittering crystals. His vision is clear — luxurious elegance, illustrated here in a leather bag with a goldplated chain and an Afghan ikat-embroidered silk satin and cotton slingback. For more, see pages 6 and 7.