One can purchase a motorcycle rain suit for kids online from websites like Amazon and eBay. Both sites have amazing community interaction and customer support.
You can bid on motorcycle rain gear at eBay. They have tons of auctions right now from slightly used to new condition motorcycle rain gear. If the bidding aspect doesn't appease you, you could go to Amazon and purchase it outright.
You can purchase rain boots for kids in pretty much every shoestore in town. Often, Garden Centres sell them too. You could also use online shops, such as Amazon, Ebay or Target
One can purchase rain guards for trucks from most automotive accessory retailers. One may also be able to purchase them from the dealership where they purchased the truck.
Prince's motorcycle in "Purple Rain" was a customized hondamatic Honda CB400a
All leather motorcycle apparel will be waterproof on the surface in case of rain.
No --- Only the driver - might make it slippery.
You can buy kids' rain boots online at zappos.com. One such rainboot I found is http://www.zappos.com/hatley-kids-rain-boots-infant-toddler-apple.
There are many places where one could purchase a pair of Western Chief rain boots. One could check sites such as Amazon or eBay for deals on Western Chief rain boots.
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Rain boots can be purchased from children's specialty stores, such as Children's Place, Toys R Us and Babies R Us and similar retailers. In addition children's shoe stores, and shoe stores in general, will offer lines of rain boots.
One can purchase baby rain gear suitable for use in all weathers from Mothercare. One can visit Mothercare stores and visit the Mothercare website to order online. One may also find equipment on the Amazon and eBay websites also.
Most department stores at the end of malls will carry women's rain coats. A lot of these stores will have higher prices than your typical retail store though so be wary of that.