As for the trousers—jeans are never a bad bet. And depending on the fit and style of your leather jacket, you can also try chinos (brown leather will look best, and probably a bomber or racer ...

And if you don't want to go for a hoodie, opt for a henley instead—it's still laid-back, casual, and easy, and the leather jacket toughens it up a little bit. As for the trousers—jeans are never a bad ...