Very pretty ANN TAYLOR Petites Silk Satin Wrap Blouse with 3/4 Sleeve Dark Blue sz 8P MEDIUM.
Tie is of a generous length and you can tie it with a bow or a knot. The spandex added to silk for stretchiness. 

Dimensions when flat:
Length 23"
armpit to armpit 16"
shoulders 15"
sleeve 17"