This is the part of the uniform that ties everything together. Baseball pants are usually quite snug fitting, but to make sure they stay up, almost all players wear elastic, adjustable belts. They range to fit around a 22 to 42-inch waist and are about one inch in width. They're usually coordinating with the team's color. In the early years of the sport, belts were used solely for decoration. Belts aren't a required piece of equipment, but they're certainly helpful. Between running, sliding and diving, belts make sure pants stay in place.