Since I fashioned my Alley Cat trousers from a modern pattern, I'm thinking about recreating another vintage Betsey Johnson Alley Cat style. If I use modern fabrics, it's not going to be obviously vintage. But you could recreate a vintage look if you change the material.
An empire style emerges once a peasant blouse pattern is secured below the bust line. I like the crossover look to form a more fitted torso. Either this tunic or a dress - maybe knee length - would work for my modern stylings. A basic peasant blouse pattern (examples below) with judiciously arranged loops or rings as guides for the cord would be my guess for recreating the sense of this. I'd cut my pattern a good bit longer because that cord is going to pull it up. I'm partial to the hairstyle in the middle too. I wore my (long thick) hair like the model in the short dress back in the 1970's ! I used little barrettes. It was not attractive!