From The Apprenticeship of Duddy Kravitz by Mordecai Richler:
Ida had just emerged from her bath and she sat in a powder blue nothing before a mirror at a little table crammed with jars. The mirror had an elaborate white frame with armed cupid carved into each corner.
I can understand 'she sat before a mirror' part but what is the bold part? Is she wearing some kind of a powder blue gown? Then, what does 'nothing' here mean?