My sister is 2 1/2 years older than me, so her clothes fitted me fairly well and I "borrowed" them quite often. Only in secret, though; she never dressed me in them or (as far as I know) knew I was wearing them.
On one occasion when I think I was about 7 or 8, I lost a game to her and her friend, and they told me that as a forfeit I had to put on my sister's dance outfit for them: a maroon velvet leotard with a high neck and a zip up the back, and a pink net tutu skirt. Being "forced" to wear that kind of thing for the amusement of two women is very much the stuff of my fantasies now, but at the time I was too embarrassed and I refused. I sometimes wonder what might have happened if I had agreed. Would my sister and her friend have realised how much I liked wearing girly clothes, and would it have become a regular thing for them to dress me up in their clothes? Would it have become "normal" in my mind, and would I now still enjoy the delicious humiliation of being sissified and emasculated?