IMO, unless you have already committed, I wouldn't wear the team gear, you look too anxious, the coach might come in on a low offer. Although husband and I wore the purple/orange, son did not. HJe has not committed to anyone yet.
Polo or nice t-shirt without the slogans, khaki shorts or long pants, neat haircut, no facial hair, clean sneakers or athletic shoes work. Same goes for Dad. Sweatshirt and nice jeans is fine.
Look like a kid, look like the Dad of the kid.