I was an Army Brat and we lived in Japan a few years after the end of the war.  We lived in an American housing area called Grant Heights in Narimasu. This location had originally been an airfield and our main street was the runway. In those days, second- hand shops were a treasure trove of nice things intermixed with junk. One thing I bought (I was in the 4th & 5th grade then) was Japanese flying suit.It was absolutely brand new and unissued. 

 

The suit was made of a canvas- like material and lined with rabbit fur. There were electrical wires to provide heat when it was plugged in to an aircraft. It is long gone now but I've never seen another one like it.

Had several. Most times the vets cut the cords off to wear as a winter coverall here. 

Found one minus the belt in a thrift store years ago. Collar looked like fox fur. Block of Japanese text on the inside flap. Right next to it in the thrift store was a smoking jacket that looks like it was made from an old Japanese blanket.

 

Funny you said it was unissued. I think there's a lot of unissued Japanese gear that makes it out to collectors.

20 minutes ago, doyler said:

Had several. Most times the vets cut the cords off to wear as a winter coverall here. 

I am surprised that it would fit many American men. The suit fit me fairly well but I was only 10 or 11 years old.

13 minutes ago, JohnK83882 said:

Found one minus the belt in a thrift store years ago. Collar looked like fox fur. Block of Japanese text on the inside flap. Right next to it in the thrift store was a smoking jacket that looks like it was made from an old Japanese blanket.

 

Funny you said it was unissued. I think there's a lot of unissued Japanese gear that makes it out to collectors.

In 1947- 1950 the Japanese were selling anything they could to simply survive.

Some IJN and IJAAF were similar, but had differences.  The Osprey book Japanese Naval Aviation Uniforms and Equipment has a section on flight suits and mentions some of the IJAAF variations as well.