Sentence:  He looked at her out of himself , she thought , as he did only for an instant at a time , the look which always surprised her even now when his uncombable <WSD>hair</WSD> was yellowing a little and his breath came hard through his nicotine choked lungs , the look of the gaunt youth she had suddenly found herself staring at in the Tate Gallery on a Thursday once . 
Meaning of the word marked with <WSD> tags:  a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss