This gorgeous, vintage, inky black, buttery silk charmeuse blouse is by French luxury clothing designer Yves Saint Laurent from the 1990's. The size tag is missing, but this top arrived with several other YSL items all sized 44 or US size 12. I also compared it to another similar YSL blouse and came up with the same measurements. The tag is starting to come undone, I did take a picture of it for you.

23 inches long
21 inches wide