Simililar Style Salutations - When you see someone wearing the same attire and you give them a compliment about it. This friendly confrontation usually resolves in both subjects in good spirits.
Guy wearing American Apparel sweater - "Nice sweater"
Responsive Fellow (wearing same sweater) - "Why thank you- Oh my it appears we both have the same sweater! What a jubilant cooinkydink! Similar Style Salutations to your choice of garment too!"