When you put on a parachute, there is usually a harness that transfers the loads to the pelvis so that under the chute you are basically sitting in the harness rather than hanging by your arms.

I think it's worth noting that this pic is fan-art for this doujin: pool #10999

Or rather, it's a commissioned redraw of a fan-art pic for that doujin.

This follows the final page where Nitori tells Wakasagi to bail out: post #2291600