Kind of off topic, but I do have some experience with someone that has done/ is doing this very thing. When I first met them, I was led to believe that she was a twenty something girl that had moved to the midwest after growing up in Beverly Hills. She claimed she designed clothing for stores such as Charlotte Russe, Forever 21, etc. She said she had a twin brother who had died a few years ago in a car accident. Then I found out she was (biologically) a he. The "twin" never existed... the twin was her before she started to change her gender from male to female. Designing clothes, living in Beverly Hills, everything she told me was a lie. When I confronted her about it, she denied it. I haven't spoken with her in a few years, but I'm sure she is still living a made-up life.