Kate Middleton matched Irish Guards' feathered plume with teal.

[{"selector":"#anim-a9b696b1-9aea-43c8-9702-c8a38d1ba5cd [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-1482abe8-c7d3-47b1-a27b-11a767aa85b5","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-313b042e-9981-4a5a-b46e-ab365731f799","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Kate, Princess of Wales wore a custom-made teal coat dress by Catherine Walker & Co. for St. Patrick's Day 2023.

The coat dress was designed to match the Irish Guards' feathered plume color, known as St. Patrick's blue.

[{"selector":"#anim-7ff37621-6600-4c1c-a27f-52d9f33dc8ac [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-6b59086d-6a81-4658-a177-3270f8be48ca","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-899f768d-67d6-4058-84f9-1d3effde496a","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}]

Kate is now the honorary colonel of the Irish Guards, taking over from Prince William in December 2022.

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[{"selector":"#anim-94842da1-ab87-4ae8-8fd6-bde0f31df150 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(-10.681818220708294%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-63b24ec1-d6e8-438e-911c-bedd9f8b6cc9","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-3dcd9508-2594-4f28-9e95-f7ee4b55ecee","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] William is now the honorary colonel of the Welsh Guard, as he is now Prince of Wales.

[{"selector":"#anim-2ce0b69a-1717-4c9c-a704-6701a581f47c [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(5.303030322337445%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-78ef580a-43c9-44a9-b725-3970646ebb1c","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-0c08fbba-b2e1-4ffa-bf4b-a2ecb9c494fa","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] William praised his wife, calling her a "committed, focused, and already incredibly loyal 11th colonel."

[{"selector":"#anim-b2ebb38f-2d70-4880-b3a4-202e52d89926 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(6.3636363868049415%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-092f77d4-1f63-4852-ae8e-1374afee70c1","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-9eebfb93-dfa3-4369-89e0-9fa77c592323","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Kate took her first royal salute as colonel during the St. Patrick's Day event.

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Kate's coat dress had defined shoulders, a straight skirt, and a belted waist.

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[{"selector":"#anim-a1a1ef56-bf45-4dd5-95b5-4f94e015543b [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-db08920a-93b2-43e5-901d-619e86c65821","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-30caf671-fd83-4ec6-b9bc-dcffaf7a310f","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] She wore a fascinator, emerald drop earrings, and the Irish Guards' shamrock pin.