Everything matchy matchy burgundy. The deep, dark red is the result of mixing red with a dash of green and blue, resulting in brown with purple undertones. According to Canva - It is more sophisticated and serious than true red, symbolizing ambition, wealth, and power. Burgundy works well with shades of gray, such as light gray or charcoal gray. It also pairs beautifully with turquoise, golden yellow, and tan brown.
Burgundy is quite versatile and looks amazing on most horse colours - its will pop on a Gray, and look sophisticated on a Chestnut. Bays of all shades will also take well to Burgundy, but the colour will look more subdued on the darker coats.