You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: PRESIDENTIAL FIRSTS 
Clue: The first president to cross the Atlantic Ocean while in office, he did so to meet with other world leaders

Answer: wilson


Question: Category: ROYALTY 
Clue: It's the name of today's longest-ruling family in Europe, in power for most of the last 711 years

Answer: grimaldi


Question: Category: CLOTHING 
Clue: Article of clothing named for an old character who dressed in loose trousers in Commedia Dell'arte

Answer:
pantaloons