Stores selling secondhand clothes, shoes and accessories are poised to benefit from President Donald Trump’s trade war even as businesses the world over race to avert potential damage, according to industry experts. American styles carry international influence, but nearly all of the clothing sold domestically is made elsewhere. The Yale University Budget Lab last week estimated short-term consumer price increases of 65% for clothes and 87% for leather goods, noting U.S. tariffs “disproportionately affect” those goods. Such price hikes may drive cost-conscious shoppers to online resale sites, consignment boutiques and thrift stores in search of bargains or a way to...