I was in the Running Room last weekend and they had some clothes there with the Canadian maple leaf, but I'm not sure it would be considered good enough for racing. But you can check out their web site (www.shop.runningroom.com) goto running room fit wear and click on the Canada drop down. Louis Garneau would be another to try.
Kristin.
I have some Canadian temporary tatoos I like to wear. They stay on for the whole race and look quite coolio. As for good race gear I have yet to see anything cool with the CDN on it.