An unfashionable wearer of both socks AND sandles at the same time can be defined as being a shandle.
A spotter of such crime can also be refered to as a shandleir.
Tourists in European countries in high summer. Usually male, may also be wearing a bumbag, god forbid! For some unknown reason will be walking around in swealtering heat wearing (commonly white) a pair of socks and a pair of sandles. Socks + Sandles = Shandles