On Olga: Karen Millen black cargo trousers ($175), black and white vest ($175), and purple zipper ruffled shirt ($175); Karen Millen, 1801 G International Dr., McLean, Va., 703-790-3120, www.karenmillen.com. Christian Louboutin Zoupi crisscross sandals ($935); Saks Fifth Avenue, 2051 International Dr., McLean, Va., 703-761-0700, www.saks.com.