Sentence:  She took the candle from him and placed it upon the desk, moving with measured grace, as a young girl might before her lover, a flowing, dancing motional set, allowing the <WSD>undershift</WSD> to swirl about her, and standing afterward so that the light from the candle would shine through the undershift, suggesting much and revealing nothing. 
Meaning of the word marked with <WSD> tags:  An unfitted undergarment that covers the torso.