I don't know if it has any other meaning but in the UK Green Gown Awards recognise progress made by universities and colleges to make their operations more environmentally friendly.
Also, I am reminded by my colleague (yes it's busy in the office today) that a "green gown" is used in, for example, folk songs to hint at a bit of illicit naughtiness (reference to grass stains perhaps).
I believe there are other posters here better able to elaborate on that kind of thing (a Tasmanian expert springs to mind).
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"Ask FunTrivia" strives to offer the best answers possible to trivia questions. We ask our submitters to thoroughly research questions and provide sources where possible. Feel free to post corrections or additions. This is server B184.