How low cut of a shirt is TOO low?

Q: I have a shirt that I really like. I don't pop out of it or anything, but it goes all the way down the the connecting piece of my bra between the two cups(if that makes sense). You can't see my bra at all though. I am average sized and there is no sagging or anything. So is this too low? What would be considered too low?

A: if it doesn't show cleavage, go for it.

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