I've never seen a rule against it. I mean, it's not like you want to go all brown....I guess grey would work too but I'd go with black. I'd use gold/wooden accessories to accentuate the brown in the shoes.
If you want different take, you could pair it up with a boho dress? Like this one: http://www.shopbop.com/talbot-djell...htm?folderID=2534374302081243&fm=browse-brand for more color.
If you want different take, you could pair it up with a boho dress? Like this one: http://www.shopbop.com/talbot-djell...htm?folderID=2534374302081243&fm=browse-brand for more color.