I had the recent eight years bought several of these shirts in size Small for sleepwear as they would not bundle up when I was turning in bed during my sleep. But while the shirts were a size Small my body was not - though such shirts were pleasantly tight all over my body while neither too tight around my neck nor my arm pits. However, this caused an excessive wear on these Small shirts as I was wearing one most nights, so although I had seven of them I could do with a fresh supply. Which I got with this yellow shirt.