Often Mr. Trump’s new tariffs are layered on top of existing ones. In this case, the T-shirts were subject to a base tariff of 32 percent based on the value of the import. Many goods typically have a very low base tariff, but garments and other textile goods are subject to some of the highest tariffs.

While some of President Donald Trump's so-called "Liberation Day " tariffs have already started, others have been paused or rolled back while the president conducts negotiations with trade partners. All the back and forth makes it difficult to keep track of where they all stand and how they might influence prices.

By Dietrich Knauth, Blake Brittain NEW YORK (Reuters) -Five American small businesses asked a U.S. court on Tuesday to halt President Donald Trump's "Liberation Day" tariffs, arguing that he overstepped his powers by declaring a national emergency to impose across-the-board taxes on imports from nations that sell more to the United States than they buy.