An aircraft inflatable harness assembly for an aircraft oxygen crew mask operating between 345 to 862 kPa (50 and 125 psi) for providing regulated flow of oxygen on board an aircraft for an aircraft crew, comprising: at least two inner inflatable tubes having a normally deflated configuration and an inflated configuration, said at least two inner inflatable tubes each having a first end and a second end, said at least two inner inflatable tubes each tubes each being configured to be inflated to cause expansion of the harness assembly to allow the harness assembly to be placed over a user's head, said at least two inner inflatable tubes each including a braided outer sleeve of polyethylene terephthalate elastic material, wherein each inner inflatable tube includes a silicone tube; an elastic head strap for adjustment of positioning of the harness assembly on the user's head; a back pad connected between the at least two inner inflatable tubes to form a contour of the harness assembly for positioning of the harness on the user's head; wherein said outer sleeve of elastic material is configured to have a first length when the respective inner inflatable tube is in a normally deflated configuration, and wherein said outer sleeve of elastic material is configured to longitudinally expand to a second length greater than the first length when the respective inner inflatable tube is in an inflated configuration, wherein a length of the outer sleeve is at least a length of the respective inner inflatable tube between transition zones of the harness created by the back pad and the head strap, with excess braid compressed along the length of the respective inner inflatable tube; wherein inflation of said at least two inner inflatable tubes causes said outer sleeve of elastic material to expand in a longitudinal direction to the second length to allow the aircraft inflatable harness assembly to be placed over the user's head, and wherein deflation of said at least two inner inflatable tubes causes said outer sleeve of elastic material to retract in a reverse longitudinal direction back to the first length to allow the aircraft inflatable harness assembly to grip the user's head with a desired head tension. at least two inner inflatable tubes having a normally deflated configuration and an inflated configuration, said at least two inner inflatable tubes each having a first end and a second end, said at least two inner inflatable tubes each tubes each being configured to be inflated to cause expansion of the harness assembly to allow the harness assembly to be placed over a user's head, said at least two inner inflatable tubes each including a braided outer sleeve of polyethylene terephthalate elastic material, wherein each inner inflatable tube includes a silicone tube; an elastic head strap for adjustment of positioning of the harness assembly on the user's head; a back pad connected between the at least two inner inflatable tubes to form a contour of the harness assembly for positioning of the harness on the user's head; wherein said outer sleeve of elastic material is configured to have a first length when the respective inner inflatable tube is in a normally deflated configuration, and wherein said outer sleeve of elastic material is configured to longitudinally expand to a second length greater than the first length when the respective inner inflatable tube is in an inflated configuration, wherein a length of the outer sleeve is at least a length of the respective inner inflatable tube between transition zones of the harness created by the back pad and the head strap, with excess braid compressed along the length of the respective inner inflatable tube; wherein inflation of said at least two inner inflatable tubes causes said outer sleeve of elastic material to expand in a longitudinal direction to the second length to allow the aircraft inflatable harness assembly to be placed over the user's head, and wherein deflation of said at least two inner inflatable tubes causes said outer sleeve of elastic material to retract in a reverse longitudinal direction back to the first length to allow the aircraft inflatable harness assembly to grip the user's head with a desired head tension.