My team recently invested in two different uniforms. This year was our first year going to a sleep-away UCA camp and there was no way we would be able to be outside with the new powerfit Varsity long-sleeve uniforms in August. We got a cheap (each girl paid around $65) uniform with short sleeves and a skort that's in my profile picture. It's honestly really cute and we joke around calling it our tennis uniform (I mean, honestly, it kind of looks like we are about to hit the courts). The fabric is more breathable, almost like a lacrosse uniform's fabric if you have any idea of what that feels like. Perfect for hot/humid games/events. We have worn this uniform for camp, one game, and POSSIBLY one more. NJ's weather can drop like a dime, the other day it was 100 degrees and the next was 82 and raining.
I do agree with the coaches though. Traditional uniforms (not my team's summer one) look way better with liners and I always hate going without a liner when I wear one. But the one we got and the tank top style ones have a very complete look to them even without any type of liner.