Just like basketball teams have to wear kits during games, referees have their own dress code. All the referees involved in a basketball game should be easily recognizable by all players, coaches, fans, and television crews. With that, basketball referee shirts have to be distinguishable and all referees must have the same uniform.
Referee shirts are made of light, breathable material, which allows referees to comfortably officiate the game. Basketball is a global game with several leagues worldwide, but there isn't a specific pattern that is followed by all basketball referees around the world. Since basketball is usually played indoors, it is recommended that referees use short sleeved shirts. Referees are always moving, and get sweaty quickly.
Although each country, league, or competition adopts its own pattern and color scheme, referee shirt colors are generally discrete.