From the seller:
favorite things past....
chest measures 34", sleeves 23", waist 22", length 17."
|1901 Fashion Plate|
I'm pretty sure this is very late Victorian/early Edwardian. The higher in the back than front waist stay, the very fitted sleeves, the pin tuck at the top of the sleeve, and the pigeon front are all typical of the Turn of the Century era.