This is the Jeans Jacket (pattern #204) from Petite Plus Patterns.
This pattern has really great instructions. I lucked out in that I didn’t have to make any alterations. (Usually, I choose a pattern that fits my shoulders/neck, and do an FBA and maybe add room in the bicep area.) I did not have to lengthen this. I’m 5′ 7″ (170 cm), which is not petite, but my legs are longer than my torso. It hits me below the waist, where a traditional jean jacket would hit.
One thing that I really like about this jacket is that I can wear it unbuttoned and it doesn’t fall open. Usually, if I wear a jacket open, all the front fabric slides off my bosom and ends up bunched up at my sides.