Get good gloves as your hands will be taking alot of hits.
Also kneepads as pestobanana suggested since you will be kneeling for cover alot and it sucks to kneel on bbs or on a pointy rock or root when outdoors.
Also a couple of other suggestions would be to get something for your neck like a shemag and something for your head. Doesn't have to be a helmet.
A Canadian is someone who knows how to make love in a canoe - Pierre Berton