Modesty is definitely an issue in the Bible. There are however other issues that should also separate us from the world. While not dressing
like a harlot is proper according to the Bible, dressing modestly and proper is not what makes us born again, or spiritual or anything other than modest. Good Biblical standards are not wrong, they just aren't proof enough of who we are or how spiritual we are.
Don't forget that the Amish dress modestly, so do some Pentecostals and Mormons and other cults. Christians and non Christians alike have followed the same certain styles of dressing for centuries.
When we discussed some of these issues on the old BB, I mentioned that most of the time, I do wear dresses, especially out in public. Here's just a little scenario to make you think. If I went to the local Mall in a nice dress that covered my knees and was not low cut, and met up with say, Hillary Clinton, and she was dressed in the very same outfit- how would you know that I was the one that was the Christian?
When we use standards as an end all, we miss the point and begin to judge others according to our own standards. It becomes a contest to see who can be the most "separated," and we begin to judge each other's level of spirituality and even confession of faith by which standards we hold to.
The test of your spirituality is what your personal relationship with Christ is. Your own personal relationship with Christ is what leads you to lead a separated unto God.
If you judge ones spirituality only by how they dress, we might think Princess Di was a wonderful Christian lady!
Too many IFB's, myself included, use standards, even though they are good, to judge spirituality, when they should be more concered about their own personal relationship with Christ. Standards should come out of what your personal relationship with Christ is, not the other way around.