Some things that may be accessories for one team may just be part of a uniform for another. There are going to be times where you feel like quitting because your team is poor and can't afford nice things like other teams, but I can't stress enough that money should not matter! As long as you're having fun and learning something that's all that should matter to you. One accessory that many teams don't have and you shouldn't worry about are warm-ups, most teams can't afford them and the teams who do, probably have to pay a lot of money to play for the team though. One accessory that is nice to have is adidas volleyball socks or actually any brand you want or matches your uniform. If your team can't afford socks, then all the players should go out together and buy socks if they want them bad enough!
Adidas volleyball socks would look great with adidas volleyball uniforms because they would match. And they would look even better if you had women's adidas volleyball shoes as well. I really do believe that it looks nice when you have the same brand from head to toe than a couple different ones!