A common feature in Spain is the almost general usage of the nazareno or penitential robe for some of the participants in the processions. This garment consists in a tunic, a hood with conical tip (capirote) used to conceal the face of the wearer, and sometimes a cloak. The exact colors and forms of these robes depend on the particular procession. The robes were widely used in the medieval period for penitents, who could demonstrate their penance while still masking their identity.These nazarenos carry processional candles or rough-hewn wooden crosses, may walk the city streets barefoot, and, in some places may carry shackles and chains on their feet as penance.
They come in different colors, presumably according to the liturgical season. Regardless, don't look for such a procession in your hometown soon; it'll be a looooong time before the other guys in hoods are dead in the American psyche.
Makes me wonder, though ... did the other guys steal the idea from us?