During WWII, the C-2 was an inner-wearing sweater for the mid-temperature or cold zones. It can be worn inside aeronautical flight jackets such as A-2, B-3, B-6. C-2 sweater is not used in large quantities. The C-2 sweater is not too thick, and the wear and tear are very high. The collections that can be preserved so far are rare and of high value.
Its appearance is very low-key, early OD color is a yellowish olive green, and some even close to brown, zipper closure is characteristic. You should know that in the military uniform that pays attention to efficiency, it is often to choose the pullover，but the C-2 is still arbitrarily using a zipper, the front has a pocket to place small objects, similar to the baseball sweater's knitted thread collar design, wearing an unexpected spirit.
