100% Authentic YSL silk cream tank blouse

100% silk Yves Saint Laurent Sleeveless blouse, tank top. Label read size 8, feels like a US 4-6. Although it’s wrinkly, it’s clean and in good condition. I have only worn it once w all white flowy midi skirt jacket ensemble similar to Carrie Bradshaw, when she married Big. There is a couple of very faint light gray marks towards the bottom, which I tried to show in the last picture. I think this is from hanger dust, likely to come out with a dry cleaning. Tucked into a skirt, it cannot be seen.