For me, the first bra I wore was my mother's. The final instigation was overhearing my mother giggling to my aunt that we were probably the same bra size. When I tried on my mother's bra, I found out she was right! It fit like it was made for me.
I could not help but think everyone who told me to wear a bra was right and my mother even correctly guessed my bra size. And I wanted to prove them right by wearing a bra, but I was afraid to do it outside my home.
I was a latchkey kid, and would rush home from school and get into one of my mother's bras and look at bra ads and catalogues and learn everything I could about bras. Of course, with my mother's bras and the bra ads were panties and hosiery and shapewear, so it was impossible for me to ignore them. I figured if I already needed to wear a bra, like everybody said, I should also try wearing the other intimate apparel that went with them. I found I loved how silky and soft and smooth they felt. And they looked much better with my bras than anything boys wore.
I started wearing panties or pantyhose or shapers to school those days when I didn't have PE. What I really wanted to wear was a bra, but I knew everyone would be able to tell. So, I would sit in class and think I should be wearing a bra like all the other girls, but at least I was in my panties or shaper or pantyhose like the other girls.
Of course, those days I had PE, I wore my boys underpants, but would soon invariably be on the skins' team and run around all class topless, my naked breasts constantly jiggling, sometimes bouncing wildly, and my nipples getting hard, thick and longer in the cool gym air. Those days when the girls had the gym right after us and would be waiting in the bleachers watching the last part of our class, I would hear them giggling and whispering, and I knew that it was about seeing me bare breasted, breasts jiggling and bouncing and nipples engorged. I initially hated PE, but over time, got used to it. I even thought of it to myself as my "titty show." and would laugh to myself I could put on a better show if I could have just worn my mother's panties or shapewear or pantyhose or better yet, her thigh highs or garter belt and stocking instead of my gym shorts.
I really knew a lot about intimate apparel, was familiar with everything my mother owned, and loved how I felt and looked in it.