I put my chestnut in blaze orange and it clashes awesomely with his copper coat. I did it first because we trail ride a lot through the woods, then I decided it clashed so wonderfully that it would be his color permanently. It's almost obnoxious, but I still like it.
Orange (chestnut) and blue are complimentary colors, so that would certainly pop if that's what you want. I really like hunter green on my sorrel, or purple. Burgundy, while in the red family, actually looks awesome on chestnuts too IMO. Posted via Mobile Device