Try this experiment;
If you find a belt or just use a belt that holds up your pants try this.
Go out in your yard and stand next to a tree, telephone pole or whatever.
Have a short piece of rope to tie around the tree/pole and tie the other end to the belt around your waist.
Now slighty bend your knees and slowly allow all your weight to hang from the rope.
The pain is incredible! I seriously doubt you will be able to let all you weight hang from the rope.
Now imagine falling a short distance and coming to a sudden stop. YIKES!!!
Had a friend, several years ago, have me do this experiment. Needless to say, the next day I bought a safety harness.
Worth the trouble, I guarantee it!