https://www.tribuneindia.com/news/comments/why-army-shuns-local-high-altitude-clothing-158278

"........Despite India being one of the world’s largest garment and footwear producers, it had failed miserably in making clothing items like Down jackets, insulated trousers, gloves, socks, mittens, caps or even triple-lined snow boots for its soldiers to combat temperatures averaging minus 20 degree Celsius. These drop precipitously further to minus 40 degree in the upper Himalayan reaches, accentuated brutally by the merciless wind chill factor.

The Army was also wholly dependent on imported Arctic tents, sleeping bags, backpacks, ice-picks and associated rudimentary mountaineering survival equipment, essential for survival at those vertiginous heights. The limited Ordnance Factory Board (OFB)-made extreme cold climate clothing and equipment (ECCCE) supplied to the Army, like jackets, trousers and boots, were not only ill-fitting and operationally restrictive, but also inadequate against the cold even at heights far less than that of Siachen or the LAC....'