When my then boyfriend (now husband) were in a long-distance relationship, we used to take turns visiting each other every few months. On my first visit to Auckland, he was pretty excited for me to meet his friends. One of his friends bought his girlfriend along to dinner and I was mortified because we were wearing the exact same dress from Cotton On.
We must have known as soon as we saw each other but ignored it. Until the boys discovered it after our dinner was over. They thought it was hilarious. We did not.