Keira Knightleyhistorical flicks always run the risk of falling prey to the bridal gown. InAnna Karenina, the more unhinged Anna becomes, the more always-the-bridesmaid-never-the-bride-gonna-get-shitfaced-on-champagne-at-the-reception-and-bang-a-groomsman-in-a-broom-closet her dresses get. P...