Aristotle with a Bust of Homer (Dutch: Aristoteles bij de buste van Homerus), also known as Aristotle Contemplating a Bust of Homer, is an oil-on-canvas painting by Rembrandt that depicts Aristotle wearing a gold chain and contemplating a sculpted bust of Homer. It was created as a commission for Don Antonio Ruffo's collection. It was bought and sold by several collectors until it was eventually purchased by the Metropolitan Museum of Art. The mysterious tone in the painting has led several scholars to different interpretations of Rembrandt's theme.
https://en.wikipedia.org/wiki/Aristotle_with_a_Bust_of_Homer
I can't speak for the environments, but clothing was fairly basic two part tunics for most people during Aristotle's time. This painting was done 1300 years after his death, and during a time when much of history could be just conjecture.