Personally, I see nothing wrong with Christian heavy metal, as long as it is enjoyable. Generally I don't listen to Christian music because it's not usually well done.
Actually, to get to the root of my feeling about music - I feel that music is an expression of God even when the musician doesn't intend or understand it that way. I think melody and song are divinely inspired. I wouldn't lump all music into this category, but surely some of us have heard a song that on the surface may be unchristian, but the sound of it moves you on a spiritual level.
But I'm getting away from the topic at hand. I do think dress is important, but only to a certain extent. Children should not wear "adult" clothing. Adults should be cautious and mindful when choosing clothing, but to obsess over showing skin seems to me to be unreasonable. I dislike the piercings/tattoos/heavy makeup/unnatural hair the most. The clothing comes second to me to what you do directly to your body.