How can I convince my sister not too wear too short and cleavage?

Anonymous
My sister is 20 years old and she always prefer to wear short mini skirts and too cleavage. I am too worried about that she never listens and cares me. Unforyunately , her nipples are too obvious in her clothes. how can I stop that?
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so?
How can I convince my sister not too wear too short and cleavage?
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