Perhaps one strategy that might help is to change your "selection of girls".
Something I find interesting about this topic is that it seems when people complain about modesty, one of the things they are saying is, "All the hot (women or men) I'm interested in dress immodestly!!!" Then they get upset at the person who is engaging in the immodest behavior, which is certainly better than condoning it, but what the underlying thought seems to really be is, "All the hot ones dress like they're easy. WHY OH WHY can't I find a hot girl or guy who covers everything up so I can feel better about being attracted to him/her???"
I could be wrong. Perhaps the complaints lodged here are also about all the "non-hot" people wearing bikinis and immodest clothing as well. But from what I've seen, there are two kinds of complaints about tiny clothes. The first complaint is, as I said, that all the attractive people dress that way and it's more of a lament about not finding a really attractive person who behaves in a more "Christian" manner, because, what the person making the statement is REALLY wanting... is to find an extremely hot opposite gender counterpart to be their significant other. The second complaint will be about people dressing immodestly who, maybe don't have the fittest bodies, and so there is ridicule for that under the guise of saying that they too are dressing immodestly.
Immodest dress is something to get upset about with the right reasons, yes. But I also think it's important to look at one's own heart and motivation as well.
If you find the girls you're attracted too are always dressing immodestly, why not look for the girls who aren't dressing that way and try striking up a conversation with one of them? You know... the girl at the beach who's in shorts and a t-shirt reading... or maybe at the library... (GASP! I know that sounds horrifying but hey, that's where you'll find me.) If you're upset with the pool of women who dress in a way that upsets you, try associating with the women who don't dress that way. You are talking to an audience of women right here on CC who will often fit that bill. A few female coworkers of mine, for years, tried to convince me to buy bikinis and skimpy clothes, saying, "You have the body for it, you need to show it off," but that's just not my style. I am, by and by, a jeans and t-shirt girl and always will be.
Predictably, however... when the suggestion comes up to change who you are looking at or are attracted to... the answer comes back that the women who don't dress that way... aren't the "hot" ones... or at least... aren't "hot enough"... which brings us to other matters of the heart.