See details about this type of uniform here
ArawazaⓇ WKF products are approved by the World Karate Federation to be worn in official tournaments sanctioned by WKF. ArawazaⓇ WKF uniforms have a specific color of embroidery on the chest and back of the neck and can also have embroidery on the shoulders.
ArawazaⓇ Premiere League uniforms have red or blue embroidery on the shoulders, chest and back of the neck making it easier for spectators to identify the competitor in their AKA / AO position. Premier League uniforms are accepted in all WKF events; however, they are mandatory in WKF Premier League tournaments. If unsure, you must verify with your federation or the organizing committee of your tournament if they allow this uniform to be worn by competitors.