In the first comment under the previous post, Shayne Davidson said the nurses’ uniforms reminded her of the BBC series Call the Midwife. Her comment made me look anew at the photo above, which also came from the United Kingdom, and wonder if the young sitter might have been preparing to work as a midwife or visiting nurse. The photo is roughly the size of a postcard, but slightly more square and blank on the back.
In the detail image below, you can see that her sleeve has a stiff white cuff, a common feature of nurses’ uniforms. Above the cuff, the sleeve has pinstripes; I don’t know if those were common:
Her outfit looks new, which may have been the reason for this informal photo session. In any case, her friend on the chair next to her seems to approve.