Hard to say. Pretty early on I was very attracted to grown men (like teachers) – I had very intense fantasies as a young teen about a male gym teacher. Or I would sometimes get a crush on another boy at school.
As I was on the smaller side (still am), somehow imaging myself in the fem role thus seemed very natural.
And with that, an interest or maybe assumption that I should look more like the sexy women I saw on TV, and actively try to make myself more attractive and desirable to men.
That led to pantyhose, which felt great! And things progressed from there 🙂