Jungle Kit is either the same as Desert Kit or the same but dyed green. So you can either wear a 2 pocket shirt tucked in (like the lightweight modern shirt) or a 4 Pocket shirt as a jacket (like in the 'Aint half hot mum' picks), then you can wear shorts or long trousers.
Another easy WW2 loadout would be a khaki boiler suit, black beret and a belt. If anyone asks, you just can't remember where you left your tank.
Belt should ideally be black P37 one.