Kate Middleton made her debut as a colonel of the Irish Guards on St. Patrick's Day.

She wore a blue-tinted coat, which has been controversial for not being traditional green.

The coat is an exclusive creation by Catherine Walker that fits Kate's silhouette perfectly.

The coat has pronounced shoulder pads, a slightly raised collar, and flattering pleats.

Kate completed her look with matching accessories in the same color.

She wore a shamrock brooch and a Jane Taylor ruffled headpiece.

After the main ceremony, Kate and William visited the Junior Ranks dining room.

They were offered beer by the guards.

Kate delivered a speech expressing her support for the guards.