Months after a disastrous visit to the White House, the Ukrainian president had a whole new look.New negotiation, new look. When President Volodymyr Zelensky of Ukraine arrived at the White House on Monday to meet with President Trump, he had swapped the military-style clothing that has been his de facto uniform since the war with Russia began in 2022, for a more statesmanlike ensemble: black field jacket, black shirt and black slacks.Was it an early sign he was ready to make some concessions?That may seem a ridiculous question. But Mr. Trump is someone who cares deeply about the ceremony and...