Hand embroidered. Chain stitch. Viking overdress. Love the embroidery design in the corners at the top
Here are a few educational links to the primary research, inspired by this image: http://urd.priv.no/viking/smokkr.html, http://www.darkcompany.ca/beads/beads.php, http://www.medieval-baltic.us/vikbuckle.html,http://medieval-baltic.us/bau-loops.pdf
Early Norman tunic from Loki's Locker - the motif is acanthus leaves.
Viking tunic medieval clothing for men LARP costume and cosplay
This just might be our teacher, Mr. Frederick, when he was a bit younger, but definitely no more fun-loving than he is now.