The. Royal. Wedding.

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Ted, Prince William was wearing the uniform of a mounted officer of the Irish Guards, since he has been appointed the honorary Colonel of the regiment.

According to the People website: "The mounted officer's uniform features a scarlet jacket, a gold and crimson sash, gold sword slings (without an actual sword inside) and a forage cap. He will also wear the Garter Sash with the Wings of the Royal Air Force, the Garter Star and the Golden Jubilee Medal."

The tunic/jacket has buttons worn in two rows of four, reflecting the regiment's position as the fourth most senior Guards regiment, and the collar is adorned with a shamrock on either side. The shamrocks on the collar have a crown on each leaf, which may have looked like acorns.

The forage cap is the typical officer's cap seen in many militaries: a short black brim, red band, and a larger, blue-black, round top.

The 'Garter Sash' is the sash of the Order of the Garter, in blue satin (it looked to be true blue, not royal blue). It crossed his chest from left shoulder to right hip, under the epaulette on his left shoulder. His wings were a badge/patch affixed to the Garter Sash at his left shoulder. The Golden Jubilee medal is a large round medal suspended from a navy ribbon with two narrow yellow-gold vertical stripes.