green gown

noun1

1. •
   (no longer used, historical) A dress that has been stained green from rolling in the grass; generally with allusion to sexual activity, especially a woman's loss of virginity.

   • Oh, a morning to tempt Ioue frõ his Ningle Ganimed, vvhich is but to giue Dary VVenches greene govvnes as they are going a milking; […] — 1604