The most handy, comfortable and cool rainsuit I could find, comes from Ducksday!

Fully Water- and windproof, waterproof zippers. The velcro tabs on the sleeves and elastic at the bottom of the feet make this rainsuit snug and adjustable, designed to fold into itself as a carry bag, fluorescend strips for more visibility, and last but not least nice prints and cool designs.
Can be used in several occasions: in the back of a bike, on the beach or just playing outside ... without mum worrying... High quality finishing at a reasonbale price.

Brand: Ducksday
Sizes: 9 months up to 6 years
Style: Big Star