Do I Know You?

>gettin chilly out. lets worship Satan!
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As I was walking about campus, I found myself behind a woman who was veiled head to toe except for a very small area around her eyes. As I walked beside her, another woman approaching our direction glanced at her and started a conversation with her about classes and what not in a way which I would assume means they know each other as friends.

My big question is: how did she know the veiled woman was her friend? All you can see is her eyes. I mean, I understand that there are few fully veiled people around our area, but still... I can only imagine what it must be like in the middle east where there's hundreds of women all fully covered. Fucking confusing.