Circa 1950s. Size Small.
Brand is Elegant.
I immediately thought of Sandy from Grease upon finding this gem! Perfect for any coquette, pink-lovin' babe. This knitted sweater was made in Canada -- it features long sleeves, a vertical knit, and a flower applique with a small pearl embellishment for decoration. The scoop neckline is scalloped, and the overall garment has decent stretch. 
 
Flat-Lay Dimensions:
Neck opening - 6.5"
Armpit to armpit - 19.25"
Sleeve - 30.25"
Waist - 18.5"
Bottom Width - 16.5"
Top to bottom - 23.25"