For my friend's Urd costume, we're getting one from witchwigs.com... I can't remember the name of the wig, but it's the last one in Street Wear (I think) and comes in silver grey. It runs about $50, but there's no shipping fee and it's a pretty decent wig. (My friend has it in red already.)
Clothes make the man.
Naked people have little or no influence in society.