If you're on the glitter bandwagon and want to sparkle day and night -- go for it.
Same with mis-matched hair-accessories, frayed jeans and funky belts, and generally, anything that shouts YOU.
This does not apply to the black trenchcoat.
In fact, of all the possible wardrobe options available universally, I think that symbol of everything-that's-wrong-with-America needs to be banned.
Or at least, if you really must wear it, dye it pink or blue or green or something.