WU IN LONE STAR STATE: Bad weather delayed but couldn’t stop Jason Wu. Violent thunderstorms that canceled flights and knocked out power to a half-million customers forced the designer to miss his own party at Nordstrom in Dallas on Thursday night. But he finally made it on Friday. “We are trying to build relationships with the stores that have been with us since the beginning,” Wu said at Nordstrom in the NorthPark Center mall. “It’s about these one-on-one encounters to make it extra special [for the consumer] and going the extra mile.” His collection is carried in five Nordstrom stores, and the designer’s fame for designing First Lady Michelle Obama’s inaugural gown has given him a big boost, said Margaret Hinojosa de Garza, Nordstrom’s designer buyer. Wu created six exclusive pre-fall pieces each for five key accounts — Nordstrom, Neiman Marcus, Bergdorf Goodman, Saks Fifth Avenue and Jeffrey — and he plans to do that for additional accounts for spring. “This economy has forced us to reevaluate what we consider to be luxury, and that’s about not seeing the same thing everywhere,” he said.