Large is VERY Roomy!
I really enjoyed having this with me in Roatan earlier this month. I really liked being able to slip out of wet swimsuits after my dives and walk back to my room in just the towel/robe/poncho.
I just want to put out there that the size chart that says the biggest waist size for the large is 38" is definitely misleading. I'm a plus size gal - 40" waist, 50" hips and the large was still very roomy on me. I was undressing under it so along with my chubby body, I had my arms and shoulders inside and there was plenty of room.