Frugi Boys Waterproof Puddlesuit (1-7 Yrs) - 4-5 Y - Yellow Mix - Available at M&S
This Frugi puddlesuit means they can splash around in the rain until their heart's content. It's made from all-over waterproof mesh fabric with adjustable straps, with snug cuffed ankles that feature cute raindrops. Stirrups are attached to the bottom for a secure fit. Frugi branding adds a finishing touch.