It's a matter of impression. The Muslim view is that the women in the west are too immodest. A woman who is must not be flaunting her cleavage everywhere and "sexualizing" herself simply because a physical object to be desired. Objectification is a huge problem in the West just because many women are extremely over-exposed. The veil helps to preserve few volumes of surprise and then an interest simply because a boy finally turns out to be inner with a girl. Of course, the bike is what specifically tend to elicit negative opinions from Westerners far more than the uncomplicated hijab.