I don't think I've ever encountered a character who's so sassy with such a limited sense of humor.
"You're wearing jeans. Those sophisticates on your squad would have your badge if they saw this."
Ah, good. He was annoying her already.
Context - she usually dresses to the nines, and has been annoyed that he isn't always dressed to exact professional dress code (ie. a bit scruffy b/c he was at crazy intense training for a few weeks and needed to shave, lack of a tie at the office).
I'm sorry, but 99% of the population is likely to make a light teasing remark when they see someone who always dresses in a strict fashion regime (say super formal wear) presenting in a very opposite one (in this case casual, though same thing often goes the other way as well).