Few events in fashion are as anticipated as tonight’s annual Costume Institute Gala at the Metropolitan Museum of Art. The dresses, the red carpet, the double air-kisses — it’s all there. We talked fashion history with Harold Koda, the Costume Institute’s Curator in Charge, and got his take on Alexander McQueen. Tonight’s gala celebrates the current exhibit Alexander McQueen: Savage Beauty, curated by Andrew Bolton, with Koda’s support. See the feature…