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The Aṅgsa is a fairly-sized rectangular piece of cloth, used by both novice monks and those fully ordained.

                It is similar to a a woman's shawl, but covers the left shoulder only, joined by fasteners or a button positioned at the lower right abdomen.  Sometimes it's worn more tightly.  It's sewn from one piece of cloth, and includes a pocket in the front, occasionally.  The left shoulder can also be pulled up when necessary, exposing the left shoulder.

                It can be looked at as having the appearance of a muscle shirt, or the use of an undershirt.  It is used when one is alone, or working, for the purpose of not having an unclothed appearance (due to the left shoulder being covered).  In the era of the Buddha, the shoulder cloth was not used.  Even in the older era of Thailand, the Aṅgsa  was not commonly used amongst the Sangha of monks.  It probably became a traditional men's clothing option during the older era of Thailand in which it wasn't common to wear an upper-garment while alone.

                Normally, the Aṅgsa isn't a requisite of a Buddhist monk, or novice monk, but that of a female monk, or novice, and laypeople undertaking Buddhist precepts who are women.  They will probably use a shirt or a shoulder cloth for the purpose of concealing their upper chest area, while still having it fastened.  Including the sitting cloth, or nisīdana, similar to underwear, when it is the 'time of the month' will use to wrap and cover sanitary napkins, as used in the present.