A reader writes:
Sometimes viewing things through a 21st century lens can be very misleading. I think there is a pretty good chance this young man is just a late bloomer and not a transsexual. Most noticeably, he does not appear to be making any attempt to actually look like a girl. He's just in a dress. Of course I may be wrong, as I'm not an expert on the history of the practice of breeching, but I remember seeing pictures of my grandfather in a dress when he was at least five or six and nobody assumed he was a transsexual.
Or he could be what is sometimes called pre-gay: dressing as a girl in childhood before realizing he's gay in adulthood. But breeching is also a possibility. Details on the practice:
Breeching was the occasion when a small boy was first dressed in breeches or trousers. From the mid-16th century until the late 19th or early 20th century, young boys in the Western world were unbreeched and wore gowns or dresses until an age that varied between two and eight.
The main reason for keeping boys in dresses was toilet training, or the lack of it. Dresses were also easier to make with room for future growth, in an age when clothes were much more expensive than now for all classes. The "age of reason" was generally considered to be about seven, and breeching corresponded roughly with that age for much of the period.