What does it mean when a guy seems surprised when he sees you dressed up?

Anonymous
I had to go from one job to the next and was pretty dressed up (blue sundress; heels).

When I walked into the break room, a coworker (and friend) was back there. He gave me a shocked look with one eyebrow furrowed and the other raised but didn’t say anything. He typically at least says something. I said hello which he responded to with a quiet hi.

I’m just curious if that reaction meant anything or if I should just ignore it.
What does it mean when a guy seems surprised when he sees you dressed up?
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