Fisherman
You are right on, there is only one detail.
There is a religious group called "Bando evangelico de Gedeon" or Gideon's Evangelic Band. They were the ones dressing in an all white attire (males and females); the friends were called "batiblancos" not "patiblancos". The meaning of "batiblancos" was white robbed and "patiblancos" means white legged; the brothers were not dressed like that, the last thing that they wanted was to be easily identified by their appearance.