The woman, who did not want to be named, said she was absolutely delighted with her purchase and the couple would add it to their extensive Beatles memorabilia collection at their home in Derbyshire.
The teal blue jacket, dating from the late 1960s, had expected to fetch between £8000 and £12,000 when it went under the hammer at Hansons Auctioneers in Etwall, Derbyshire, yesterday.
The three-quarter length jacket has a mandarin collar and a slight flare to the sleeves. It has a small tear on the left sleeve.
Lennon left the Nehru-style jacket at his English home when he moved to the US in 1971 and passed it on to friend Jo Jo Johns, who cleared out the star's house.
Lennon lived at Tittenhurst Park in Ascot, Berkshire, from 1969 until August 1971, when he set off for the US, a journey from which he would never return.