If painless death is not the primary goal, but effectiveness is, then our world is extremely mortal. A gas stove can be a source of deadly danger, but it is dangerous not only for you, but also for those around you. For example, a body dropped from a height of 50m will fall for 3 seconds.
h=(at^2)/2
50=(10t^2)/2
100=10t^2
t=√10=3.16
In one article, I saw that a speed of about 110km/h is deadly for a person, which is about 31m/s. And the speed reached as a result of falling for 3.16 seconds will be exactly 31m/s.
Note that clothes are made of fabric that can be torn into rags, and rags can be made into a rope. If the rags clearly cannot withstand weight, they can be braided, which will improve their strength characteristics. It is also worth noting that tying hands behind the back can prevent unwanted attempts to interrupt the process. Trees are a great place to hang various things.