I run in hunter green/navy, but keep it in check. I really don't like when people OD on color/matching. Color is on the saddle pad, reins and my bridle has hunter green padding. I wear white breeches, a navy vest and a black helmet always. My polo is either navy or white, but I have worn light blue (stable shirt) before.
Putting down a good run is more important than matching to me. But, here we are:
No green reins in this one, but you can see the green padding on the bridle