I use only Gildan brand ultra cotton tee shirts with a weight of 6.1 oz. Although they are prewashed by the manufacturer, I have found that they shrink about 1" in width and length with the first wash. The sizes are unisex.
I personally measured the shirts, and for the width I measured across the chest under the arms. For the length, I measured on the back from the top of the neck to the bottom of the shirt.

 MEDIUM  W 20"
 L 33 1/2"
 LARGE  W 22 1/2"
 L 29"
 W 24 1/2"
 L 30"
 2 XL
 W 27"
 L 32"
 W 28"
 L 33 1/2"

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