Please see pictures for details and measurements.
Notice how the chest measurement is 22.5 compared to a normal 24 inch chest measurement- This means it will be tighter than a normal T shirt. Compare it to a medium at 22 inch chest.
See pictures for details and measurements.
Everything is measured this way when laying flat:
Chest: Armpit to armpit
Length: Bottom of Collar to the end of bottom of shirt.
Waist: Straight across the top of pants.
Inseam: From crotch seam to the end of the leg
Rise: Top of the belt to the end of the crotch