In this sentence "His first YSL collection, a big hit, was distinctive, all right-all of the clothes were in black and white", does it mean that just YSL had the right to make clothes in black and white color? Like copyright for books, films etc.
Perhaps the punctuation is confusing the matter.
If you have given us the complete sentence, then perhaps:
"His first YSL collection, a big hit, was distinctive all right – all of the clothes were in black and white".
In which case "all right" simply adds emphasis to the assertion that the collection was distinctive.
For example:"Even from a distance I could tell it was my brother all right – he walks just like that".
not a teacher