Came up with this (relatively unsecure) method to simulate straitjacket bondage:
Step 1: size a belt or rope such that when buckled/tied you can put both arms through and when brought up to your upper arms behind your back you can hardly move your arms outward
Step 2: tie the ends of 2 socks (must be very long, at least almost knee height) together
Step 3: equip the belt, have it hang losely by your elbows
Step 4: slide the socks onto each hand (not necessarily as far as you can for this next step)
Step 5: now slide the belt up your arms as much as you want to tighten your upper arms (not too much given how far your socks stretch/reach)
Step 6: cross the arms to create a loop and step into said loop with both legs
Step 7: bring your arm loop up to waist level and slide the socks back up your arms (they will have moved in step 5)
Step 8: done!
Getting out: just tug your wrists/lower arms out of the socks, they should give easily (test this prior to setting everything up)
Obviously this isnt incredibly secure as the socks will only hold to your arms via friction, but it still emulates the feel well.
I'm wondering how you could improve the resistance of the arm loop, and any other variations that improve security & safety.