He has a fleece lined, but not padded waterproof, which he wore most of last winter, but occasionally wore a puffa type on really cold days, which doesn't fit anymore. The thing is he walks to school and at playtime is running around so tends to get quite warm, and not sure I want to spend money on something which won't get worn very often. Could I just put an extra fleece on him on really cold days? He's 5.