noun
small opening in traditional Japanese clothing; armhole-like slit
Abbreviation of 身八つ口. Refers to the small opening where the sleeve meets the bodice, below the armpit, in some traditional Japanese garments. Used in contexts of kimono construction or historical clothing.
See also: 身八つ口
この着物には身八つが付いています。
This kimono has a miyatsu opening.
身八つ口は、袖と身頃の間にある小さな開きのことです。
The miyatsuguchi is the small opening between the sleeve and the body of the garment.