Melania Trump has a new look.As the incoming first lady walked into St. John’s, the Episcopal church in Lafayette Square, she cut the figure of a mafia widow or high-ranking member of an obscure religious order, and a bit of “My Fair Lady.” She wore a sharply tailored navy coat, with a soft white silk crepe blouse peeking out from beneath the collar, and a huge navy boater trimmed with a white band. In a rare showing of bipartisanship from the fashion industry, which had very publicly thrown its weight behind Kamala Harris, the ensemble is by American designer Adam...