Bright shorts are good. Something in your hair that is brightly colored if you use a scrunchy that is not interfering. Best color in shorts are red, purple, bright green, or bright blue. But I really like a sock that is bright and striped. Be sure that you have good shoes that have been worn and proven to be comfortable for you.
Shoes can make a difference on the touch of the ball.
Blisters that stop you from playing are not cool. Wear the appropriate shoe for the surface of the field. Come to the tryout fit and match ready You should be practicing and physically fit to play. If you come to the tryout and you have not played for a month, it will take you 2-3 tryouts to look your best. That is too late.