The fabric is a 100% light-weight flannel cotton so that it will drape well on a long, thin frame. These do have a slim fit, so if you generally find yourself between our sizes, you might want to go up a size if you prefer a more relaxed fit.
Machine wash cold and tumble dry low to minimize shrinking
Hot iron if needed
Do not bleach
The chest measurement is straight across the front of the chest from armpit to armpit. The length measurement is the full length from top to bottom. The sleeve measurement is from middle of collar to end of sleeve like traditional dress shirt dimensions.