Is Vivian westwood a luxury brand? What grade is it?

Vivienne westwood is a luxury product, which can be said to be a first-line brand. At present, there are counters in mainland China and Shanghai, and there are also small shops like fashion shops in other places, but not many. It seems that there are three branches in Hong Kong, and Vivian westwood in Japan is cheaper. I bought its underwear in Japan, and the price range is about 160 to 230 RMB.