Sentence:  Winston wrenched his body out of bed — naked, for a member of the Outer Party received only 3,000 clothing coupons annually, and a suit of pyjamas was 600 — and seized a dingy <WSD>singlet</WSD> and a pair of shorts that were lying across a chair. 
Meaning of the word marked with <WSD> tags:  A vest; a sleeveless garment with a low-cut neck, often worn underneath a shirt.