A rare CISO produced jumper/sweater, its almost like a sleep shirt in material but cheaper feeling (I for one wouldnt want to wear one in a humid climate). They were produced in black and in this dark green, this jumper will feature in Jason Hardys book series in the future.

These would have come under the auspices of Ben Baker, Deputy Chief of the U.S. Counterinsurgency Support Office (CISO) and have been part of the various sterile unform and equipment items produced in Japan to support SOG.

Courtesy of Jason Hardy at Dog Tag Militaria.