Nothing says fall to me like earth tones, especially leather earth tones. Leather pants are always a staple in a fall and winter wardrobe but this year browns are definitely on trend. I love this high wasited bell bottom pair. It is a little retro, but very chic. Paired with a crisp white button down gives you a very sophisticated and trendy look but you could also style them with a chunky sweater and play around with different colors. Of course black would work great as well as playing with shades of brown would work for a cool monochrome look.
I didnt go full monochrome but I did just so happen to find a leather jacket in a similar shade with my pants, making it look like a full suit set.
The fedora is just a little fun element to pull together the look and make it extra fall style appropriate. The shoe is also something you can adjust to to be weather appropriate, whether it be a suede open toe, a bootie or a pump. Adding a cute belt is another option to switch up the look.