Ash (LASangster) and I worked on this together...
On the head: big umbrella hat, with corks hanging off it. Keeps rain and flying things off, and also keeps hands free.
Body: high-vis jacket. He thought it made you invisible, like in "Hatty Porter".
Legs and feet: waterproof trousers with a frog pond in a pocket, wellies with flippers. He was told about plagues of frogs and he's taking no chances. When they come, he's got the gear to take them to a pond.