Another theory that is along the same lines:
One theory is that it started when impoverished 16th century farm workers had to conceal their faces to avoid being recognised while begging during winter, as asking for money was illegal.
@NurseHolliday started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Another theory that is along the same lines: