Sister, don't wear so tight. If it is too tight, it will affect your development. If it is too loose, the chest will sag. This is not good. I remember wearing a small vest when I was a child, with a thin sponge pad inside. Don't be embarrassed when shopping. What kind of formal underwear store to go to, my aunt will introduce you and teach you how to wear underwear. Remember not to wear it if it is too tight! Then the corset ~