Nice work Soulinertia! However, to me it looks as if the background color is black, not navy. Also, there does not appear to be any shadow on the orange circle and the stars do not seem to be in any of the reference pictures. Finally, I am not convinced the three lines on the bottom are ones. They look like they spell out three in Roman numerals.
It would be a rather strange thing then, because the webbing is no standard Molle or Pals, if you look at the image where he is sitting in the sand, you can see that the spacing is not even. I believe it's something along the lines of what zookone said, a professional harness used in construction or rather industrial climbing, window cleaning and so on.
Also the Harness seems to emerge from the webbing sleeve towards the back somehow, which makes me believe the harness is one unit, but his arm is in the way.
Is it possible they commissioned a custom run of climbing harnesses just for the movie?
None of the industrial harnesses I've run across have the same leg and gear loops as the one in the reference pictures, which is why I thought the costume designer combined a recreational harness with a padded tactical belt. But I agree that the spacing of the webbing on the sides is not consistent. Also, the color of the fabric is not very tactical in nature, rather it looks to be a combination of black and grey threads, with grey accents. Further, this webbing runs only along the sides, as the back does not contain any webbing, but there is two layers still in the back.
Here's where I am at with the whole harness...
1. Red and light grey leg loops with orange, non-locking buckles. Buckles likely custom, as all climbing harnesses, industrial and recreational, have double back buckles. Also, leg loops appear to be flipped. Unpadded section with the buckle usually comes across the thigh, not on the inside of the thigh.
2. Same colored harness going into a padded belt with nonstandard webbing. Webbing stitched in with uneven increments. The color of the padded belt is black and grey.
3. Shiny, double back buckle for harness on right side, which is not too common among harness manufacturers. Most have the double back buckle on left side. Buckle maybe Petzl?
4. Harness tapers on left side. Closest harness I've found is an old Petzl Hirundos, but the taper and buckle are both on the wrong side. Also, the leg loops do not match.

5. Underneath red and light grey harness is another strap coming out of the padded belt. How does it attach?
6. Vertical strap buckles attaching harness and suit are of the
Cobra variety.
7. On right hand side, a
Cobra D-ring buckle, attached by orange webbing to padded belt holds orange and black webbing.
8. Back of the harness has a NASA logo affixed. Embroidered?
9. Gear loops are orange or red. Attached at an angle, which is also uncommon.
10. Leg loop support webbing attached by a Cobra buckle.
This harness hunt has proved way more difficult than I thought. Attached are my reference images. Apologies for the longwinded post :unsure







