2 Piece Basketball Jersey Shirt and Shorts Kids/Adult, Sleeveless Basketball Sportswear Kids/Adult, Basketball Kit No.23 for Kids/Adult

My little nephew has a birthday coming up and I need to buy a basketball jersey as a birthday gift for him, is this basketball jersey recommendable?

Is the size of this basketball set as described by the seller?

Will it be shipped on the same day of purchase? How long do I have to wait to receive this basketball jersey?

what ages are the children size? how can you guess without a size chart what do Child sizes 4XS, 3XS, 2XS, XS, S, M mean?