CAPITAL CITIES: “I feel like I’m an almost honorary Washingtonian,” said Jason Wu, he of the multiple MObama credits, who visited the capital this weekend for two days of events. On Friday night, the designer previewed his fall collection at the Long View Gallery, with a party co-hosted by Nordstrom and Vanity Fair’s Amy Fine Collins, followed by a public appearance at the department store on Saturday. “It was an amazing success,” said Wu, whose cocktail bash and one-hour personal appearance made more than $200,000 in sales and pre-sales. “One customer bought 41 pieces, basically the entire fall collection.” Tonight, the designer hits up another town, this time across the pond. Christine d’Ornano and Plum Sykes are co-hosting an event for Wu at d’Ornano’s London home.