Eye recognition

Visited the souq today. There weren't too many people there. I think most of Doha works on an afternoon and evening type of schedule but there were some women coming into the souq as I was arriving. They were locals and dressed from head to toe in the black abbaya that they wear which included a total face covering except the eyes. Three women squealed and rushed at each other in a display of happiness and recognition and started chattering away to each other. Ok, I don't think I have ever looked closely enough at any of my friend's eyes to be able to recognize them just by eyes alone. I guess it is certainly possible and obviously it's what you have to do when there are no other facial features showing. Is it something else as well? do these ladies wear a certain decoration on their clothing that is recognizable to their friends? Based on what I observed, I don't think so because they were all in solid black. Since they all squealed and rushed, I don't think it was a planned meeting but since I don't speak Arabic, it is sure hard to say. I am going to make a point of looking at eyes now to see if I can recognize people just by eyes but that's going to be hard for me to do with everything else available to see, clothes, face and hair.

Pictures
ladies at the souq
souq
bobbleheads