Hi. I'm a single virgin dude, so when it comes to modesty of dress and what tempts guys, I'm more than qualified to answer.
Modesty is in the mind, not the clothing. C.s. Lewis actually commented on the matter, saying that a fully-clothed woman in Britain and a near-naked woman on some tribal island could be equally modest, or equally lewd, depending upon how they carried themselves.
Keep in mind, the body is only as shameful as you make it; if you are showing off to attract lewd thots... I mean thoughts... then you are portraying yourself lewdly and in a shameful manner, whatever you are wearing. But on the other hand, treating the body, which is made in the image of God (albeit a bit flawed, thanks to sin) as something to be ashamed of is just as disrespectful to God's creation as treating it like some cheap toy is. The question is not if you're showing off or what you're showing off, it's why and how you're showing off. In Africa some women go topless and it's considered modest, while in the Middle East even your most conservative Christians would be considered lewd without a burqa.
You see, as a single guy, I recognize a woman's beauty, and I can assure you that a woman's beauty is a treasure. Maybe you hide your beauty away like a secret treasure, or maybe you display it like a wondrous work of art. Both are beautiful, and both are modest, and both can be shameful if done wrongly.
As for the matter of "dressing to attract", I think there is a significant difference between lust and admiration. Lust is desire to own, coveting something and reducing it to an object for your own selfish pleasure. Hardly something that one should do to a treasure like a woman. (Or man. This goes both ways, you know.) But merely admiring and appreciating the beauty of what God made is in no way wrong; God made all of you, and if you happen to have a cute butt or whatever, He made that too. Modesty isn't about avoiding all forms of sexual attraction, it's about knowing how powerful your attractiveness is, and not abusing that power for selfish desires, but rather using it to praise God. In such a way, I think an artistic nude is completely modest, as it is not intended to be sexual in any way. Remember, God didn't invent clothes, Adam and Eve did when they were filled with sin and became ashamed of what God had made. God gave them clothes not because it was suddenly bad to show their bodies, but as a way to help them in their struggles with shame that they were now feeling.
I could go on a long rant about how lust and admiration are different, and why I think a girl can dress to be attractive and wear whatever she wants so long as she's doing it in a way she's at peace before God with, but my fingers are cold. Also, sorry for not displaying any pictures of what I think modesty looks like, but I think the admins would ban me, because I would choose an image of a woman in a burqa, and an artistic nude. Because modesty runs the gamut between them both, just as sinful thoughts of the body do.
Remember this above all: your beauty is a gift given by God. Respect it, protect it, but don't be afraid to enjoy it and show it. God gave you something truly special. Don't be ungrateful.