It is a good idea to bring a change of clothes for practice after uniform days. Shooting in uniform is difficult and often uncomfortable, and some sweatpants and a sweatshirt or t-shirt and hoodie will be much more preferable to most. You can change in the school in a bathroom or locker room (that you have permission to use if you are on a team). Please do not plan to change at the range itself; that bathroom is cramped, and you are using your own practice time. Thank you!