Saint Laurent Yves Blouse Size 8

Stunning vintage ivory blouse by YSL Encore. V neck blouse with a ruffled color and ruffled sleeves. The material tag has been removed but I would assume the material is either silk or satin - I unfortunately cannot confirm this. This blouse is in excellent condition but their is a very minor spot on the shoulder (see photo). I have not tried to remove the stain so it would probably come out. Smoke free home