Don't overdress. You should aim to be comfortable after 10-15 minutes of riding. This was a big one for me. I bike commute year-round (down to 10F), and after I learned to not overdress I began arriving at work or home cool and refreshed instead of hot and sweaty.

For fall:

+1 windbreaker in front, venting in back. Same for leggings (If necessary). A couple of years ago I saw some non bike specific light workout tights with a venting strip down the sides. They are perfect. But I don;t usually wear them until it gets down below 40F. I secure the bottoms with black elastic hair bands...have not died from embarrasment.

I also use cheap cotton work gloves in the fall. They block enough wind but still let my fingers breath. You can wear them under or over your bike gloves, and the ones with those textured rubber grip-dots work really well on the bike.

Layers are the key for me. Not only do they trap warm air, they allow for modifications. I commute with a back pack (usually on the back rack), so I can carry extra layers if I have underestimated the cold, or to carry the layers I have shed if I overestimated the cold.

If you are a recreational/sports rider, you may want to consider a small backpack, or frame bag to carry an extra layer of clothing.

TLDR: Windbreaking but Breathable, Don't overdress, allow for adjustments.

And don't forget hi-vis, reflectors and at least blinkies...it will start to get dark early.