These things are not the real deal no matter what the store that sells them for over $400 claims.
And here's what Mike Rowe has to say about the concept of pre-unwashed work clothes.
May I say that the "Borax wash" he mentions closely resembles the attributes of grout clothes, with which us relatives of driller folks are well familiar....They make the washing machine go clunk, clunk, clunk, and can stand on their own even after your best efforts to clean them.
On the other hand above are work clothes. They are worn by someone who gets them dirty with real dirt. The others are just wannabes.