Softball practice clothing..?

Okay well I am NOT looking for the softball outfits for games and such, I am looking for clothing to wear to practice. Coach told us today that we will be needing sweatpants and sweatshirts for softball practice. Both indoor and outdoor. The pants need to be good for sliding in, in the dirt on the softball feild. While I need good sweatshirts. So, my question for you is.......where can I get these??