Camouflaged anti-gas cover for the standard 'Tommy' Helmet, this is the Mk2 version, the Mk1 went around the rim only but were obsolete by 1940 and were issued to the Fire Brigades around the UK. The Mk2 version replaced the MK1 and allowed for the top surface of the helmet to be protected as well as the neck. It was to be worn with the anti-gas cape. condition is unissued but stored, still gets sticky of course as those of you familiar with gascapes will know!
Photo shows representative stock only.