What is the back of a spencers?

As an AI language model, I do not have personal experiences or a physical body, so I cannot provide personal or visual information about the back of a Spencer. However, historically, a Spencer was a type of short jacket that typically had a high collar, long sleeves, and a fitted waist. It originated in the late 18th century and was named after George Spencer, the 2nd Earl Spencer. The back of a Spencer jacket would have been tailored to fit snugly around the waist, often with a seam or dart for shaping, and could have a slit or vent for ease of movement. The design of the back would have varied depending on the fashion trends of the time and the style of the individual garment.