Here's a dress I found in my collection that looks so similar to the Jane Sterling character . It's a sheath dress with a boat neckline, bloused bodice, elastic waist and narrow sash belt. The closure has a back metal zipper, and the dress is unlined very 60s. This one is sleeveless whereas Jane's character is short sleeved. I also noticed that the color block patches coordinate except for one that is a dark brown. This dress is by Diane Young , a label from the 50s and 60s that manufactured shirts , blouses, and ladies dresses.
It measures 40 around the bust, the waist is 26" to 30" and the length is 42". Hand wash.