We seek to make sure that our musicians know their role is to draw attention to the surpassing greatness of God’s glory in Jesus Christ. That means clothing that would draw attention to them is inappropriate. Categories include clothes that are immodest, tight, “loud,†dirty, or sloppy. Of course, those standards are variable in different cultures and to different people, but usually every church has a fairly defined idea as to what qualifies. Regarding modesty, we want to avoid anything that accentuates or reveals what could be sexually alluring.
By the way, our pastors, who stand on the side of the stage as we sing, are dressed in a variety of styles. We purposefully want to communicate that we don’t believe a certain kind of dress equates to godliness. While we appreciate and respect the conviction some have that dressing up is a way of showing honor to God as we meet together, we’re convinced that God places the greater emphasis on the heart attitude behind what we wear, and that the church will always have a wide range of clothing (James 2:1-5).
This sort of attitude towards dressing for worship is one thing that has also been coming up in the church history class that I've been listening to lately. One of the things that's been discussed there was a push during the reformation away from the clothing of a roman catholic priest to more academic apparel in order to emphasize the role of preaching. Still, this also reflected a push to less specifically-ecclesiastical clothing.