In Buddhism, Yogi (Burmese: ယောဂီ) term is normally quote/ refer to male or female practitioners who are maintaining their Silas (precepts) or Mediators who are doing Vipassanā meditation. The term Yogi is very command in country Burma (Myanmar) and normally when they wear the Yogi clothes or dresses people will know straightaway as who is Yogi since some people in Burma they wear the specific form or clothes with White and brown or just brown or wrap with Brown tower to be noticeable of Yogi. Normally when they ease the Sila they will remove from that clothes. Tropically that Brown color is taken as refer from one of the Light of Buddha that came out from Buddha's head even though the light beam is can be control by Buddha not to emit when he wanted but if in normal default 6 kinds of light beams are always came out from Buddha's head.
But nevertheless and no matter whatever for the religious he/ she may hold or non religious person, someone if who is practicing Vipassana Meditation or Mediators still quote as Yogi and in reverse usually all Yogis are still maintaining Silas such as not to killing or stealing or so on when he/she practicing medication. So in this case even though Yogi term is very command in Buddhism but for other religious/atheist[ who as long as practicing Vipassana Meditation are still called as Yogis.
But in Buddhism just keeping 8 precept ( Silas) and fasting as not to eat meal after 12 noon still called as Yogi, regardless or practicing meditation or not. In most cases a people who telling Buddhas sermons or just wearing that Brown clothes still will be called as Yogi as long as if they seem to have Silas.
In Myanmar if wearing that Yogi cloth people are respect to them and as long as if they wearing those normally can be freed from the risk of get wet by water in Myanmar Water Festival and people usually not dare to throw them by water.
In many cases usually Yogi term is put as Title before the someone's name when they are conducting Vipassana courses as example: Yogi John.