My son's HS it was the same "Cleats, socks, baseball pants (white only), belt, team issued practice jersey and team issued hat. However, it had to be clean every day. The only place kids were allowed to dress was in the locker room and you could not leave the locker room without changing into your school clothes.
Your baseball atire was to be worn on the field only. Hats were on straight or you were likely to get a stern talking to the first time and then it was not so pleasant.
If you wanted to play baseball; you had to look and act like a baseball player (not basketball, z****r, or any other sport).