When it's frigid (meaning down in the 50s!), I usually bring my longsleeve shirt. If the rest of the crew brought one, we wear it. If even ONE of us didn't, no one wears it. (This is for any level - 7th, 8th, 9th, 10th, JV, V).
I don't own a jacket - waht's them thangs for?
I do have a rainjacket I cut to short-sleeve length that's very thin, but waterproof, and white. I will wear it under the normal shirt if the rain's particularly bad and it's cold out, but usually it just makes me hot, so I just get wet.