The shirt has no listed size on it, but would comfortably fit as a women's small. It's cut is similar to that of a hospital scrub. 
The design is sometimes called the "icaros" and is a common pattern in the creations of the members of the Shipibo tribes. The patterns are common visions of those that are sitting with the Ayahuasca medicine and often a part of the clothing of the maestros administering the medicine. These patterns show up everywhere in Iquitos and it was great to be able to bring that visual home.