What do I need for a proper under-dash rewire?

Chained_360 said
I'm talking about this stuff. Looks pretty nice and easy to gain access to stuff if you need it again. View attachment 1715254203

Looks similar to what was use don the body harness into the trunk. Buyt my guess that is a little different if its the same as used by USAF like Halifaxhops says.
Those have a closure? velcro?