@MrSheen
Green is supposed to be unlucky at weddings because it's the colour of the Fairy People and birds in the house (even images of them, for some) are supposed to bring death. And red was treated as inappropriate just because it's red.
Meh. Everything's inappropriate or unlucky in somebody's superstition.
In my case, I heard all these (and was banned from wearing red lipstick/was always on the receiving end of criticism from red or green clothes, etc) from my mother. This leads me to suspect the superstitions probably featured in a Catherine Cookson book at some point, especially as when a white streak emerged from my parting, she went nuts more than usual at any rate about that.
Strangely, she focused upon emeralds being unlucky after reading about it in a Shirley Conran book and completely ignored the superstition about opals being unlucky when she had an antique ring set with tiny opals.
It's almost as if they were all designed to make people women feel bad...