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You could look for something like “type 1 leather jacket“ or “type I” https://therealmccoys.com/products/type-i-leather-jacket_030-black
The Real McCoy's
TYPE I LEATHER JACKET
The TYPE I LEATHER JACKET takes on a timeless denim pattern introduced in the 1930s. Leather adaptations of this silhouette are scarce and highly sought-after pieces of vintage history. At the core of the Type I design are its unique pleated front and rear panels, providing the wearer with added freedom of movement. Wh

It might also just be a leather bomber.
check out vintage Schott or Avirex listings on Ebay too