|Got this image from Google Image Search via eBay.|
As you can see, this is a tan blazer with dark brown leather patches on the elbows. Note the large brown buttons, too. As you all know, this item is perfectly suited for looking professorial. Imagine wearing this coat, resting one's elbows on a large desk (excellently protected by the patches!) while grading term papers and/or pontificating about... smart-people things.
All I know is, once a person dons this attire, they are immediately imbued with educational powers far exceeding the teaching capabilities of the normal man or woman. It's a fact.