President-elect Donald Trump's threatened tariffs could hit Shein and Temu hard.Jakub Porzycki/NurPhoto via Getty ImagesTrump's second term may not bode well for Chinese fast-fashion brands in the US.The president-elect has floated the idea of tariffs of 60% or more on imports from China.Gen Z-favorite brands like Shein and Temu will likely be hit hard by such tariffs.Donald Trump's victory in the presidential election could spell trouble for Chinese fast-fashion brands, particularly Gen Z-favorite budget brands like Shein and Temu.On Monday, Trump said in a Truth Social post that he intends to slap China with an additional 10% import tariff — on top of any tariffs he already plans to impose.