Ask H&H: reflective rugs

Q: MY six-month-old foal escaped from the field and was killed on an unlit road at 3am. It occurred to me that if the turnout rug she was wearing had had the benefit of some high-visibility additions, she may have stood a better chance. I have found very few rug manufacturers offering high-visibility elements to their rugs and those that do only offer it around the back of the rug. How can I make my horses more visible?

WM, West Yorks