[The pattern for this particular sweater may be found here.]
Step 1: Terminology
Other words that will help to narrow a search are cardigan, crew-neck, pullover, lace, bolero, and shrug.
Step 2: Needle Sizes
My favorite decades are the 1940s and 50s, and vintage sweaters from these eras generally utilize very thin yarns and needles.
American needles use small numbers to describe small/thin needles. British needles are sized in the opposite direction. So, a size 0 needle in a British pattern would require bulky yarns and a size 0 needle in an American published pattern is very thin and delicate.
Step 3: Sizing
Another option is choosing a thinner or thicker yarn and a suitable needle size to make the existing pattern smaller or larger as needed.
Just make sure to calculate how those changes will affect the finished size of the garment!