Baseball chest protector

[umpire23]

Another reason why MLB umpire's cps do not look so bulky is becuase they wear a larger shirt then their usual size when doing bases. They will tend to wear a size or two bigger than their normal size shirt to make their chest protector look invisible almost and then there are MLB guys who like the bulkiness who wear their regular size shirts for both base and plate. It just depends on your preference.