ROB :
Why the obsession?
1. Because arayos is an avera that lev hoodom chomeid oson, and requires extra concern.
2. Because it is hard to think of another avera that is as tempting that someone else can cause you to do. Personally I don’t care how they dress at home. Just don’t be machshil me in the street! The street is a reshus harobim and it is the biggest chutspah for someone to dress how they want and compel me as a religious jewellery to have to cope with the nisoyon they unnecessarily create.
3. They don’t have to be as untzniusdig as the goyim, to still be seductive and alluring, and… ossur. Anyway, since when did we set ourselves standards based on the goyim?
4. Why do you think only in extremes. Either a shikse or a sack of potatoes. …. There is plenty of room between that to look nice and still follow the torah!