This tunic was purchased in the 1970's in Jamaica by my parents. I wore it a few times andt washed it once or twice.
Based on how it fits me now, I think it is a Medium
It has been in a pet free, smoke free home.
It is multicolor, with the main color reddish-brown.
Width of neckline 13 inches
Underarm measurement 42 inches
Hem
Measurements 51 inches
Length from neckline to hem 26 inches