We may have to eat our words, but as it stands 12 Years a Slave is unlikely to win the Best Costume Design Oscar. It does tick some of the necessary boxes: it’s period (mid 19th century), features both crinolines and cravats, and is part of the popular ballot. Yet being as the protagonist spends most of his time in just an increasingly distressed tunic shirt, the Academy may just feel costume designer Patricia Norris has really not worked hard enough. Flippancy toward the Academy aside, 12 Years a Slave remains a wonderfully rich costume experience. Every fibre leaps off the screen with detail and feeling. The cool weave of…