My Tee came today, too, just tried it on for a perfect fit! So, I'm 5'8"or 9"
and usually take a M or these days a Large in a shirt or Tee shirt.
The measurements of the tee laid out on the floor are:
across the chest = 53 cm
from top to bottom = 73 cm
Sorry about the poor image quality from my crap phone.
The tee is a great fit for me, and plenty long enough. I was also pleased by the quality of the material.
The printing quality is good, fairly bright, and should last a few washes!