See, a man made law, not God's law. You are God's chosen people and you are defying God, not following His laws and commandments. Time after time throughout history you've done this. God does not want you to be legalistic, but rather to pay attention to why it's important to be faithful and prayerful. Clothes are a worldly thing and even in Old testament days, you were warned not to be worldly. This is worldliness in spades.
15 police officers killed in Colombia helicopter crash (Reuters)
from the article: Six women arrested for wearing prayer shawls at Western Wall