It just seems that if a girl dresses in a oversexualised way that means that she is more interested in getting attention then having a genuine relationship.
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I am the same way. Usually when she dresses more modestly, it's more comfortable than tight sexualized outfits. From my experience, women dressed modestly are more relaxed, and they are more fun to be around. All of this results in a higher frequency of attraction towards those who dress modestly.