Players that wear a different colored jersey on the volleyball team is called defensive. This is also known as libero.
In 1984, the NFL allowed defensive linemen and linebackers to wear jersey numbers in the 90-99 range, since more teams were making use of the 3-4 defense and thus were quickly exhausting numbers for linebackers, who previously were only allowed to wear numbers in the 50-59 range. Since 2010, defensive linemen are allowed to wear numbers 50-59; this is in part because of the interchangeability of linebackers and defensive ends (a defensive end in a 4-3 defense would be an outside linebacker in a 3-4).
Baseball players wear numbers so they can be easily identified on the field.
defensive lineman and some linebackers do wear 99
because if they dont wear it they will be distracted by girls attracted by them
They wear majestic uniforms on the field
A basketball Jersey is a the shirt's players wear to identify which team they are on usually they are numbered.
for a custom nfl jersey