No Material Tag, but feels like Polyester, or Polyester Blend

No Size Tag, but measurements suggest a Modern Womens Size M

See Measurements in photo

It appears that there use to be a cami, or lining underneath the top because there are button straps by the shoulders

Preowned, vintage, so there are signs of wear, there is discoloration in various areas of this top, no holes or spots/stains, mainly just discoloration

Thanks for looking, please let me know if you have any questions