On tonight’s The Good Wife, Alicia Florrick (Julianna Margulies) steps out of her power-woman business suits for a more formal look, and we caught up with the show’s costume designer Daniel Lawson to get the inside scoop on giving the show a black tie appeal. “It’s great fun to take it up a notch,” he told InStyle.com exclusively. “Viewers should expect to see white tie and tails on Peter, Eli, and Kresteva, and handsome tuxedos and stunning gowns on the background players.” As for the star, her look (a little preview is above) was chosen with careful consideration. “I had two beautiful gowns for Alicia,” Lawson noted. “It came down to the fact that one looked like the candidate’s girlfriend would wear it and the other looked like the candidate’s wife would wear it. I wanted Alicia to look sophisticated and stately.” Tune in to CBS tonight at 9/8c to see the formalwear in action, and come back to InStyle.com tomorrow to find out all the designer details.

Plus, see every outfit from The Good Wife!

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