C.J. Mahaney has been posting excerpts from the forthcoming book, Worldliness: Resisting the Seduction of a Fallen World, on his blog. The excerpts he is posting are from the chapter he wrote on modesty. He has posted four out of seven parts so far and I've really found reading them to be enjoyable. That is, if you consider it enjoyable to be convicted of sin.
I highly recommend reading these posts. I'm eager for the book to come out- it sounds like something that would be quite helpful to me.
"...modesty is humility expressed in dress."
-----Pastor C.J. Mahaney