Lustrous cotton fabric (6)
I believe the answer is:
sateen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lustrous cotton fabric</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sateen that I've seen before include "Glossy material" , "Cotton fabric with a satiny finish" , "Closely woven cotton fabric resembling satin" , "Shiny cloth found in senate" , "Cotton fabric with a shiny finish" .)