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I tend to go the route of a sleeveless t-shirt. The lack of sleeves on a shirt of this type worn underneath an overshirt makes a big difference over a normal shirt. That small amount of venting makes a huge difference in cooling. Tthe stuff I wear looks like this:



They can be had very inexpensively (around $5) at your local wal-mart/target/whatever and look good underneath a button-up.