Try posting a picture of him, or a horse that is similar in color :) I'm usually really good with matching colors. Cowboy is a chestnut and he looks good in purple lol. And most bays look good in orange, or teal :3
That would be a very vital piece of information. Some english styles require certain traditions to be maintained (hunters-white or cream shaped/half pad), while others you can be flashy with colours (eventing).