Ace your holiday social agenda with these four easy pieces: 1) A dark color blazer or jacket of any type, try a velvet blazer from Gucci or a jean jacket from Frame. 2) A dark turtleneck. Trust us on this one, it’s a no-fail option that always works. 3) A good pair of dark trousers or dark denim. 4) A pair of well-polished oxfords. Throw on an overcoat or parka, a cheery scarf and beanie and you are dressed for any kind of cheer from a cozy family dinner to a raucous office party or a sophisticated New Year’s Eve.