Garment appears to date to the late 19th / early 20th century. It appears to be a women's garment in a very small (perhaps a contemporary XS) size. Measurements (taken with garment laying flat). Armpit to armpit - 16.5. Length (back of collar to hem) - 17.
Sleeve length (armpit to cuff) - 20. See gallery photos for accurate and thorough portrayal of this item.