A libero, like any other player, can be switched in and out. The purpose of this rule is so that the coach does not have to switch jerseys between players during substitutions. There are no restrictions on what kind of clothing a libero can wear on the court. He can wear whatever he wants as long as it's not distracting to the rest of the team. For example, a libero known for his flashy shoes would be allowed to continue wearing them despite not being able to earn a salary. Conversely, someone who wore glitter socks every time they played would be removed from the team after being caught by the coach. The only requirement for a libero is that he must wear a uniform. This could be anything from basketball shorts and a t-shirt to jeans and a sweater. While he isn't expected to play defense, some liberos do help out with rebounding and block shots. Some coaches may choose to have a pair of guards or wings act as liberos instead. These players would then be required by law to wear something other than basketball shorts. In general, the libero is there to make life easier for the coach by not having to switch jerseys during substitutions.