I have this, what I believe to be an early version of the British WW2 tank suit for use by tank crews. It was purchased by my father, as surplus, not long after the war for using while riding motorbikes off road. The seller told my father that it was an ex army tank crew suit. However, the suit does seem fairly heavy, to me, and it is double skinned which does make me question if it is actually some type of "jump suit" for use during a parachute jump and is intended to be discarded after landing? There appears to be no labels attached to it but the zips do indicate U.K. manufacture. The whole garment looks very well made and as can be seen by the pictures there are multiple pockets including 2 "secret" pockets on the inside chest. I wondered if the open topped pocket, last picture, is intended to hold the Enfield .38 revolver? As can be seen, the suit can be completely removed from the body by use of the double zips without the need to "climb out of the suit". It even has provision for male users to "answer the call of nature", 7th picture, with a small zipped access flap; apologies to any potential female users. :surrender: