[Pattern Help] Looking for shirt pattern but I don&#039 Sewing Machines Parts and Sales in Los Angeles

My ABSOLUTE favorite style of shirt is a square of material with a head hole and the sides sewn up a bit to the holes for the sleeves. It’s similar to a dashiki but it’s not a dashiki.

The one I am wearing right now has sea turtles on it from Hawaii. I wanted to figure out what this is called but I have had no luck. Anyone know?