This is fascinating. Over 200 Christian girls submitted questions about what guys find immodest (i.e. ways girls dress that lead them to struggle with impure thoughts), and over 1,600 Christian young men responded.
As a woman, I found the results to be interesting and surprising, e.g. that many men find it distracting when women wear purses diagonally across their chests or let their bra straps show (even accidentally), and that and that the men overwhelmingly agreed that women who choose to dress modestly do make a difference, even in our culture where immodesty is rampant.
The overview is here and the results are here. To view the results, choose a category under "Select a Category" and then click on one of the sub-categories and the results will appear below.
via A Second Generation of Homeschooling