I got brave the other weekend and made some polos in my event colors (hunter green wrap with red thread and velcro!) and they actually turned out pretty cute. I used a favorite pair of polos (vacs) as a pattern and these directions: DIY Dressage: Tutorial: How to Make your own Polo Wraps
What I learned quickly was to make the point in the fleece, and zig-zag the center down, and then go around the edges so they weren't lumpy. I found skinny red velcro and stitched two pieces together and then back and forth stitched across the edge once they were completed so they wouldn't separate. I'm not sewing literate at all (I leave that to my Mum) but they turned out pretty cute!