In soccer, it is Only the goalie that may “handle” the ball with her/his arms/hands within the team’s penalty area. However, there is No mandated special equipment for a soccer goalie. The use of goalie gloves is an individual decision, and indeed, I have played goalie without special gloves. Therefore, if the soccer goalie wore the exact same uniform as her/his team mates, How is the referee to determine who has those special Handling privileges in the penalty area? The different colored Shirt (primarily) is to distinguish the goalie who has special handling privileges from all other teammates.
Buy this shirt: Quilter 2020 #quarantined Covid-19 shirt