help with what to wear...

Good morning,
A friend of my SO's is have an art preview and reception at a tapas and
cocktail bar in town. For some reason I'm drawing a complete blank on
what to wear. I'd prefer to wear pants and something comfortable. My
closet has a pretty good range of clothes, but I wouldn't be opposed to
a shopping trip if needed ;) I'd appreciate any ideas.
Thanks in advance!
Melissa