In the fall, they will provide very little stuff. He will swing his bat or a team bat in the fall and use his old glove. If he doesn't get redshirted, they will provide glove, bat, batting gloves, all practice gear and pretty much everything he needs. This is the first Christmas that I have not bought anything baseball related. Son's team even gives undergarments for practice and games such as warm wear. As has been suggested, if he has to stay in dorms you could get stuff for dorm room but you need to have an idea on bed size and how much space he will have. We bought sheets and everything then found out he has an XL bed so nothing fit. They have a big tv in main room but he got one for his bedroom but it has to be small.
But know that each college is different. Some give everything and some give very little. Being D1 does not mean they all get the same but you can have him ask a current player. I would say all D1's give glove and bat but after that it is different. But there are certain contracts that are in place and most have certain companies they have to use.