I believe that the same thing happened with boat shoes when they were popular - the cheap knock offs came shortly after.
The problem with apparel and footwear is that it’s so easy to knock off even with good legal help. My Canadian friend from MBA school started a line of children’s clothing in the late Eighties. While the undergarments were made in the US, the jeans and heavily detailed work was made in Hong Kong.
The law firm found that employees of his contractor copied the logo and applied it to substandard products then sold it on the streets of Hong Kong as well as making it available to street vendors in the US. My friend was livid but spending tens of thousands on going after these individuals just drained him financially and he closed his company.