In this picture is seen Duke P. Kahanamoku, the swimming champion of Hawaii nei making warm clothing in his spare time on the shore of Waikiki. The young girl watching him is named Miss Kathryn Jackson of Kalakaua Avenue who heard much of Kahanamoku going to make clothes, and she thus wanted to see it for herself.
(Kuokoa, 4/5/1918, p.1)
Ka Nupepa Kuokoa, Buke LVI, Helu 14, Aoao 1. Aperila 5, 1918.
nupepa 
he’s likely working on item for Red Cross effort to clothe soldiers in World War I; Hawaii had active programs to knit warm clothing; firemen, cabbies [both had down time], nuns, Daughters of Hawaiian Warriors (no Sons then) all contributed; see http://elkslodge616.org/about/history/world-war-1/the-great-war-elks-and-the-red-cross/
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I believe so as well.
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World War I was being fought in Europe, where the winters were very cold, and it was publicized that soldiers there needed socks for that reason. Fortunately for the USA, its troops were only in the war for the winter of 1917-1918 (the war having started in 1914), and it ended on Nov. 11, 1918.
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Duke Kahanamoku’s mother, Julia Paakonia Paoa Kahanamoku also lent her services to the activities of the Red Cross. (from her obituary June 4, 1935)
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