was that a compliment?

I went to Xavier University very early today to pay for my younger sibs' tuition in time for their final exam. Since it was too early (before 7AM, to be the first in line) I passed through the student's gate instead of the visitor's and presented my alumni ID. Usually, I would just flash it to the guard with no questions asked. This morning, she was asking why I was not in uniform, I was wearing pedal, shirt and slippers. I showed her my alumni ID as an explanation and reasoned that I'd be paying tuition. Still skeptic, she grabbed my ID and looked closely at the picture. Haha.. What was she thinking? By the way, our white alumni ID is recognizable from the present year's school ID with blue background and blue XU sling. Good thing she let me pass.