E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Never wear the image of Deity in a ring. So Pythagoras taught his disciples, and Moses directed that the Jews should make no image of God. Both meant to teach their disciples that God is incorporeal, and not to be likened to any created form. (See Iamblichus: Protreptics, symbol xxiv.)
Never wear a brown hat in Friesland. (See HAT.)
To wear the wooden sword. (See WOODEN.)
To wear the willow. (See WILLOW.)
To wear ones heart upon ones sleeve. (See under HEART.)