the helmet wrap job doesn't look too bad. a tartan or houndstooth fabric, and the addition of a brim would have made it look just like a cap. the old tweed paperboy caps are probably baggy enough to squeeze a helmet into. it's worth searching the thrift stores for one. if the law doesn't specifically call for a approved helmet, then try your luck at finding an old style "american football" leather helmet. or even a polo helmet for that matter. there's plenty of good ideas on here!