The T Shirt will shrink about 3-5% with the first wash but will expand again when you wear it. We sized them a bit more relaxed to make room for the natural shrinkage. Buy your normal size if you want it slim-fitting go one size up if you want a relaxed fit.
Body = Neck to Hem
Chest = Armpit to Armpit
Arms = Shoulder to end of Cuff
Our wool has natural oils and is self cleaning. Just hang it outside in fresh air for a night. If you still want to machine wash it wash at 30 degrees wool cycle in a half full machine and use wool detergent.