In Buddhism, Yogi (Burmese: ယောဂီ) is the term normally used to refer to male or female practitioners who are maintaining their Silas (precepts) or those who are practicing Vipassanā meditation. The term Yogi is very common in the country of Burma (Myanmar) and normally when they wear Yogi clothes or dresses, people will know straightaway as who is a Yogi since some people in Burma they wear specific forms of clothes with White and brown or just brown or a wrap made of brown cloth to be noticed as a Yogi. Normally when they use a Sila they will omit the wrap. Traditionally the Brown color is taken from a reference of one of the beams of light that came out from Buddha's head. Even though the beam referenced can be controlled by Buddha, normally 6 kinds of light beams are always coming out from Buddha's head.
But regardless of the religion he/ she may hold or secular person, someone if who is practicing Vipassana meditation still maintain Silas such as not killing or stealing and so on when he/she practicing medication. So in this case even though the term "yoga" is very common in Buddhism it can also apply to other religions and lay practitioners, as well as those practicing Vipassana Meditation.
In Buddhism, those just keeping 8 precept ( Silas) and fasting after 12 noon still called Yogis, regardless of whether practicing meditation or not. In most cases people who teach Buddhas sutras or just wearing Yogi clothes still will be called Yogi, as long as they maintain the Silas.
In Myanmar, those wearing Yogi clothes are treated with respect and as long as they wear them normally can be free from the risk of getting wet by water at during the Myanmar Water Festival and people usually do not dare to throw them by water.
In many cases the term Yogi is put used as a title before the someone's name when they are conducting Vipassana courses as example: Yogi Thuta Wai.