Labels in vintage clothing can provide many clues as to where it's made, by whom, when it was made. Couture clothing is often numbered as a work of art would be.
Then there are some that I find humorous. This mint condition vintage robe (aka smoking jacket) provides a lengthy read.
The League of Gentleman
Fashions Inspired by Great Britain"
That's alot to put on a label! I suppose I find it humorous as this line of menswear is selling a specific image. The image of a well-to-do Brit. Perhaps he is sitting in front of a fire, drinking brandy, smoking a pipe and reading an epic novel while wearing this robe and exquisite leather slippers.
Well, they sold me on the image! Pretty good marketing technique don't you think? Really, all fashion is marketing an image now isn't it? When it's this lovely of an idea, I say embrace it!