Givenchy Vintage Blue Blouse Made in France

light general wear not sure of a decade, most likely 80s or 70s chest pockets buttons areva bit loose one button(bottom) is missing blue with a hint of purple approximate flat lay measurements (with fabric smoothed out to the max): pit to pit 21" length 24" sleeve 24" please note that French sizing states 42 is a Large but it runs a bit small since it's vintage. would fit a Medium better