Please note that at all the High School levels of competition, there is no restrictions to sleeves, leggings, socks or compression t-shirts. They can be any color! This also applies to athletic support equipment, such as knee braces, elbow guards, etc. Any color is acceptable.
With that said, the lose fitting T-shirts must be the same colour of the team's jersey. T-shirts can be long or short sleeves but again, the same colour as the team's jersey.