Another photo showing the same headdress:

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"Some of the men wear khaki canvas covers over their Glengarries. The covers are sometimes referred to as 'Ghillie Hats', given that their shape was supposedly inspired by the headwear favoured by Scottish gamekeepers. These covers were issued to the 1/5th and 1/6th Seaforth shortly before the Highland Division left Bedford". From:- http://bedfordhighlanders.blogspot.c...og-page_6.html