Origin of the words "khaki" and "pajama" (4)

I believe the answer is:

urdu

(Other definitions for urdu that I've seen before include "Sanskrit language" , "Indic language written in Persian script" , "speech" , "An official language of Pakistan related to Hindi" , "Analyse and develop (an idea) in detail" .)

I've seen this clue in The New York Times.

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