But can't people see that something as formal and important as a graduation is NOT a proper occasion to wear them?
I can guess that some girls are going to say: "They're comfortable, and high heels hurt our feet."
Now, come on, flip-flops and high heels are not your ONLY two choices. How about the so-called "Mary Janes"? Or, if those are too frumpy for your taste, how about kitten heels and low-heeled pumps?
I live in Taiwan, and though girls here (including myself) wear flip-flops ALL the time, we'd definitely NOT wear them to a graduation. So really... I don't know what American girls are thinking :p
更新1:
To Raychel: Hmm, I guess that's a difference between American and Asian attitudes. Here, we generally regard graduation as an event at which we must honour and respect our school, and thank our teachers for our education. In Japan, everyone even bows to (1) their teachers, (2) the flag, (3) the school.