Sounds like Ken MacLeod's The Cassini Division. The heroine wears a 'smart' suit that can morph into anything from fully protective space suit to evening wear and is powered by a nano-reactor.
Here's a quote from Amazon -- "everyone will covet her smart-matter clothing that can become a spacesuit, combat outfit, evening gown, or satellite dish at will."
I'm trading SF&F books at
Tell'em spacecat sent you!