Metallic is the must-have hue for autumn. The trick to sparking in the sunlight is to pair a gold or silver-sheen accessory with something neutral. Metallics also make excellent accent pieces. You want to look like a shiny, happy person–not a robot.Chloe waist tie mini skirt, $780; at Traceyross.com. Mick Cuff by Philippe Audibert, $350; at Scoopnyc.com. Sylphes Dress by Tibi, $298, at Anthropologie.com. Embroidered cutout slash blouse, $495; at Catherinemalandrino.com. Linea Pelle metallic woven belt, $171; at Revolveclothing.com. Matthew Williamson embellished velvet box jacket, $1,218; at Netaporter.com.