You've got plenty of options when it comes to rain gear. We've boiled it down into two general categories 1) a budget oriented welded PVC two-piece suit, for the budget minded; and 2) a range of lighter, more packable Nylon-based options from Alpinestars.
The Nelson Rigg suit will get the job done, but it's heavy. It's also pretty crude in the tech department: the old-school welded PVC vinyl will keep water out, but it also keeps body moisture in. It's mesh-lined to help improve comfort, and will certailnbely do in a pinch—if you’re on a budget, or don’t plan on logging long miles in the stuff.
The Hurricane rain gear from Alpinestars on the other hand is made of lighter-weight, more durable Nylon, with a waterproof/breathable coating. It packs down much tighter, and each piece comes with its own dedicated stuff sack. If you’re going on a trip, quit fussing and buy the Alpinestars gear. Even if you have a jacket that’s externally waterproof, or has a waterproof memberane, it’s nice to be able to don a full rain suit or separates, and keep your waterproof gear from having to work too hard—especially when you’re on a trip and don’t want to have to deal with wet gear on the road.
Note: this Alpinestars Hurricane rain gear is similar in scope and construction to the full lineup of gear we used to carry from REVIT, but we switched to Alpinestars because the fit is better. We found the REVIT gear to be too wide around the cuff, and even cinched all the way the Velcro cuffs flap around in the wind. Alpinestars Hurricane pants and rainsuit have more of a tapered leg with a zippered leg opening (with a rain gusset behind it).
All this rain gear is designed to fit over armored gear. Thart said, keep in mind Alpinestars is from Italy and comes with a slimmer Euro cut; while Nelson Rigg follows a more American fit block. Both fit relatively true to size, but if youre between sizes go up in A*, down in the Stormrider suit.