Well, you are her mother so it's entirely your call. But I say you should just your daughter wear what she wants. Bare midriffs aren't that bad and if she's not wearing them to places where it really isn't appropriate like school then I don't see what the issue is.
Let's say you decide you don't want her wearing revealing clothing, then what? Will you want her to return all the clothing she bought? Does she still have the receipts and can they even be returned after she's already worn them out?
If not, are you going to buy her more modest clothing yourself to replace all the crop tops? And how will your daughter feel about all of that? If that's the plan then you risk her resenting you for being so strict with her choice of clothing and leading her to rebel.
And no offense, but I don't understand what you said about being fine with her showing off her piercing but not as often as she's doing so. She can show her belly button ring, just not so much? She might get mixed signals from you that would only confuse her.
You may be in charge but you should pick your battles more carefully. Ask yourself if preventing her from wearing what she likes is worth spending more money on more clothes for her and risk her becoming rebellious and resentful to you. My advice to you, from one mother to another, is to leave your daughter be and let her wear what she likes.
It sounds like she knows when to dress more modestly if she doesn't wear crop tops to school and if I were you, that would be good enough for me. As for your younger daughter, I don't think there's anything to worry about there either. Children are a lot smarter than we give them credit for, they're not the fragile, easily-influenced dimwits the media likes painting them as.
If anything, just tell her that she can get a belly button piercing and wear crop tops when she's older. That her big sister can wear them because she's a teenager but she's just too young right now.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.