New imitation "vintage clothing" is being made and sold. Is there anything wrong with this?

In my opinion, there is nothing bad about it. If people want clothing in a style that was made a few decades ago, why shouldn't people get it?

Pretending that newly made similar clothes are old is a false pretense, but that matters only if the people buying those old-styled clothes make a fuss about whether they are "genuine old". Why should that matter to anyone? There is no reason to pay attention to it. Some people may try to profit because other people pay inordinate attention to the difference between "genuine old" clothes and new imitations, but is no reason to care whether they succeed in profiting from that.