No matter what kind of riding I'm doing, play riding or racing I wear the following:
Arai MXC pro helmet.
Scott series 89 goggles. When racing I use roll -offs. I also use baby oil on the vent foam to keep the dust out.
Alpine stars Tech 8 boots (I've had these boots for 8 years almost and they're great!
Sinisalo over the body chest protector-I like this one b/c it has protection for your spine almost down to your butt.
Thor fore arm and elbow guards-the most comfortable I've found.
Shift knee guards-the look pretty old school but they are comfortable and offer good protection. I keep thinking about knee braces, I've looked at them several times at the store, hopefully someday soon I'll get some and report back on them.
Kevco 10" kidney belt.
Oneal gloves. Nobody really makes any good off road gloves anymore though, ones with good padding on the back of the hands and fingers.
I pretty much always wear Sahara riding gear unless it's in the 20's that - C for you metric folks. Then I wear my Moose Monarch Pass pants and Jacket. I also wear those socks that come up to your thighs to keep my legs from getting chaffed. I wear Moose riding shorts with a the pad pockets in them, if you don't wear these you don't know what your missing, and that is no monkey butt!!
And for hydration I wear a camel back system with 100 ounces of water.
My buddy bought a leatt brace a while back, and unfortunately the first weekend out he got to try it out, got bucked off around 30 or 40mph and landed on his head and right shoulder. However, he swears by it even though he broke his collar bone. He told me the next day that his neck was not sore at all, and considering the fall he took, was okay with the broken collar bone. I have been thinking about one, have even tried one at the local shop, I have been wanting to take my chest protector and helmet down to the shop and let the fella's help me try it out. It has several adjustments so that you can kind of custom fit it to your body. They seem like a good idea. Will let you all know if I get one and how it works out.