So I looked it up and found that a redingote originated from the 18th century when it was used for travel on horse back. Originally it was a bulky, heavy, utilitarian coat but overtime it developed into a more fitted fashion garment.
Apparently today's redingote is marked by a close fit at the chest and waist, a belt, and a flare toward the hem, as in the blue version in the vintage pattern. It's not a term I see often - did it have a revival in the 1960s I wonder?
Personally, it was the fringed version of the dress in the pattern that caught my attention...so swinging 60s!