Thanks, eta; your link shows what it looked like the kids were wearing. And, jheem, The memories themselve are happy, but the longing is not. hit my point exactly: would we ever be nostalgic for a time when we were unhappy?
Your post just above also hit home (eh, no pun intended) for me: returning home is not possible. It's not just a place, but a time and a place, and people. Graduate school was one of the most intense, and intensely rewarding, experiences in my life, and I was quite saddened when I realized at the end that, even if we all turned around right then and did it all over again, with all the same students and all the same teachers, it wouldn't be the same. SIGH...