On one hand, this could be completely false. On the other, it could even be common among high end design houses. Does anyone here have first-hand knowledge of the fashion industry?
Nearly all of my nicer clothes are Burberry, purchased at a local outlet, since closed.
All the men's stuff was either "London", often made in USA with a slightly boxy fit, or nicer stuff made in Italy with a very slender fit. The labels were indeed black on the nicest items. There were also a lot of samples if I recall.
Several things I bought (an italian wool/linen suit and a black wool/mohair jacket) were marked >$1200 full retail, reduced to around $200.