Adi
I connect each end of the broad web loop to the top and the bottom of the sheath so the sheath completes the loop, then the top of the loop goes up over the top of my left sholder, behind my neck, round the top of my right shoulder, then under my right pit and round my back to the top of the sheath for inverted carry. Very comfy even with large knives (used to wear the Busse Steel Heart I swapped with Waldorf that way). Use nice broad webbing (I use 3" Army Sling Tape, but seat belt webbing from a scrappy works well too). attach it using zip ties cut off short then the ends melted with a lighter to make everything smooth and snag free.
Cheers
Shaun