My son has to have white polo's embroidered for flight team.  These are the perfect weight; not so thin they are see through and not so heavy they don't breath.  Cannot beat the price - we did a lot of shopping before ordering.
Personally, I wouldn't put "kids" in white when they are around dirt and grease as often as the team is, but given we have no choice on the color, I am super happy to find these at a reasonable price.