1970s Vintage Sirena Beach Cover Up or Jacket

From Sirena, a swimwear brand, this is a nylon batwing top. It has no closure, and was probably sold as a swim coverup. Could be especially great for evening now. Was a medium at the time, and still is - probably fits up to a 10 best. In very good condition. If you hold it up to the light, you can see some areas where it snagged on something rough (last photo), though none of these areas are holes or runs, and they don't show as you wear it.