Tibetan shirt from Tibet. No brand; it’s quite a nice piece

This shirt was purchased in Tibet by a friend/colleague and gifted to me. it’s a Mens XL if I were to guess the size. It has no brand; it seems the buttons are hand sewn on, but the shirt itself looks machine made or machine made by hand. There is one small mark by the slit near the bottom of the shirt; though hardly noticeable. Great condition