Ah, I've just found this thread after replying to Gordon's PM.
I'll copy in some of my reply here to help others.
Unfortunately, I've never had access to a screen used jacket to be 100% sure but I'll certainly tell what I've done myself.
'58 webbing. is a fair bet; there would have been plenty available at the time.
I've used '58 webbing straps on mine and it works very well.
It's just under 1" wide (mine measures 15/16").
There are three sizes of webbing strap used on '58 webbing. The thin one (probably about 3/4") used on some pouch closures and the pocket on the large pack; the 1" one used for general utility straps; and the thicker one (nearer 2") used for some specialist kit.
I think I probably cut my 1" wide stuff from an old large pack. There are several lengths on there. Or it may have come from the sides straps of the poncho roll.
What we can see from this close up of Clemens' tags is that the text appears to have been applied with marker pen using a stencil. So that's what I did with mine.
It also appears that the velcro (on the jacket at least) may be white.
However we can see in the film that Ripley's jacket doesn't have any name tags on and there are two dark strips of what are presumably just velcro in their place. Could be black could be olive. I used black on mine as I had loads.
I've got no idea about the length of the strips I'm afraid. Though, they definitely appear to be the same size on all the jackets, regardless of the length of the name.
I looked at the photo of the screen used jacket and gauged the length by eye, comparing to my jacket.
From just beyond the pocket popper to just less than the edge of the buttons is about 5".
Though, I found it hard to fit "ASST. SUPT." (Aaron's title) into that space using my stencil, so on mine the name strip is about 5" and the title about 5.5". I would have made them the same but I was 1/2" short of webbing.
I ran a length of close zig-zag stitching at each end of the webbing to prevent it fraying beyond that point. Now that mine is a few years old it's developed the 'fuzzy end' look of the screen used.
Here's mine:
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