As far as the 'new-age posturings of the Green Man Festival' are concerned, the Green Man festival has a longer history than the Bacup Britannia Coconut Dancers who also feature in the piece.

Despite some considerable misinformation to the contrary, The Green Man is a modern / new-age / Fantasy Folklore construct which has precious little to do with Jack-in-the-Green etc. And Hastings, in essence, only dates to 1983 - a folk custom dies as one thing, but it is revived as something else altogether! That said, I sported similar garb during the Morpeth Gathering Procession this year - and won first prize for best costume for my efforts:

A Green (Sedayne) Man

If you can't beat 'em... though in actuality there is a bit of serious reconstructive archaeology going on here, based on a notion that certain of the Medieval Ecclesiastical Foliate Heads are actually depictions of Medieval Carnival Masks. I based this one on a misericord at Chester Cathedral - see Here.