Jacket - Textile is most versatile. Hi-vis has been proven to reduce the accident rate. You can use solid textiles for cooler weather (to 70 or 80) and mesh at anything above 50 or so. I like the FirstGear Kilimanjaro for solid and the Tourmaster 3/4 length for mesh.
Pants - Not as essential on a Spyder as on a bike, but textile overpants help keep you warm and reasonably dry, and provide protection. We wear Tourmaster.
Helmets - Wear one that fits your head. It should be snug, touching evenly all around, with no pressure points or hot spots. Too large, in order to get it to feel better, is unsafe. We like Arai because they have several head shapes available.
Gloves - Leather, at least in the palms. There are many varieties. You may end up with several pairs. I like deerskin work gloves for all-around riding, but I also have mesh, gauntlet, winter, and rain gloves.
Boots - Over the ankle is best. Not as important as on a bike. Waterproof is handy, but not necessary. I wear custom Bates Leathers boots to fit my skinny feet, but my wife wears Tourmaster Waterproof. Mush of the time I just wear my hiking boots.
Raingear - There are a lot of variations, ranging from fulll one-piece (sometimes as a riding suit) to Frogg Toggs. Things to look for include a hood to put on under your helmet to keep water out of your neck, a good double-fold closure over the zipper, full length velcro for the closure rain-flap, a tall, tight-fitting neck that can be adjusted snugly, double-cuff wrists and ankles or adjustable velcro closures, and bright colors and/or reflective trim. Gear should fit over your riding clothes, but not be so large that it buches up in front. "Puddles" will leak! One piece suits are more waterproof. I wear a Teknic 2-piece or a BMW coverall. Nancy wears FirstGear.