WASHINGTON (Reuters) – It was one of the biggest questions of Monday's inaugural celebrations: not what would President Barack Obama say, but what would his wife, Michelle Obama, wear? The first lady cemented her reputation as an international style trend-setter with her choice of a Jason Wu red sleeveless ball gown in the evening, and a striking business-style blue navy coat and dress for the ceremonial daytime events. It was a huge win for U.S. designer Wu making one of his ball gowns her choice for a second straight inauguration. …