First of all, if we care about this problem, we can tell our girlfriend directly and explain to her that we care more about this problem. I hope she won't wear revealing clothes in the future. I think if her girlfriend really likes us, she will certainly understand us and change her way, so that such problems will not appear in the future.
Secondly, you can tell your girlfriend by hinting. For example, you can buy some clothes for your girlfriend, which is more conservative. I think if our girlfriend is smart enough, they can tell us why she did it, and she will also notice these problems when she buys clothes herself in the future.
In a word, I think it's a good thing that my girlfriend is in good shape. After all, this is our girlfriend, but if we care more about her wearing revealing clothes, we can also explain to her. I believe this kind of problem won't happen again.