There are 12 items. That's it.
What's more, most of these things are basics you already have (or may need a new version of).
Only a few of them are newer looks to kick up what you've got.
That is because the most important thing about fall, more than what you wear, is how you wear it.
There are two key tenets of dressing for fall - varying the fabrics you wear and layering them the right way.
It's not rocket science either - throw a cashmere sweater over a button-down, or get an interesting blazer (like this one pictured from Strong Suit) to kick it up a notch for more formal events.
Stick to colors like maroon, navy and olive. You'll be fine.