The Triple Echo (1973)

Synopsis
Set in England during WWII, this drama, also known as Soldiers in Skirts, stars Glenda Jackson as Alice, a bitter woman whose husband is captured and held as a Japanese prisoner of war. When a wandering soldier, Barton (Brian Deacon), comes by her farm, she invites him in for tea. They fall in love. In order to remain in the town with Alice and escape the military police who are looking for deserters, Barton disguises himself as a woman. A sergeant (Oliver Reed), who commands a tank unit, comes to town and makes advances toward Barton, whom he thinks is a woman. ~ Michael Betzold, All Movie Guide