14 of 15 people found the following review helpful
Just throwing in another size reference,
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This review is from: Doublju Mens Casual Short Sleeve Polo T-shirt (Apparel)
Height: 6 feet
Body type: Slim Athletic. My shoulders aren't extremely broad (slightly above average for my asian genes).
I ordered the US-M, and it fits PERFECTLY. This is actually a bit of a problem, because it means I can't ever machine dry this shirt. Also note that if you have an athletic build and have chest/back muscles, you can't really button more than the bottom button. When I wear this, the 2nd button from the bottom routinely comes undone, and the top two aren't button-able.
Another reference: I wear size 40-42 tailored suits.