Question regarding explaining public breast feeding to a child.

As i stated in the earlier post, I'm all for it, i would use a cover, but that's just my personal preference. My question is, how do you explain to a child that its ok for breasts to be out in public areas, while simultaneously, teaching them that breasts are private and a place that only you can touch unless you give permission? This is a serious question (I'm not hating on anyone who breastfeeds in public) it's just I've never come across a woman exposing her breast to feed with my daughter and I am hoping to be pregnant soon and plan to BS, even if though i plan to cover, my daughter will know whats going on and probably notice when others do it more often (since she'll be exposed to is more often). Thank you!