While the TL-29 was intended to be issued in a double sheath, the sheath also holding the lineman pliers, it was also a popu8lar issue item on its own in the army supply system. Not as popular as the MIL-K-818D, AKA 'demo' knife, but still a very common item in our engineer units.
A lot of the personal took some wide olive drab nylon webbing, and sewed a simple pouch sheath, just deep enough to swallow the whole knife and leave the bail sticking out the top to grab. This out the TL-29 or MIL knife on the back web belt that held up our fatigue pants.
If the parachute harness material was not available, then a length of cord was used t make a lanyard. The lanyard was just long enough to allow the knife to reach the bottom of the pants pocket with the end knot of the lanyard shoved under the web belt of our pants, thus preventing loss from falling out of said pocket. If it slid out of pocket then, it would just be dangling against your leg and instantly noticeable.
A third option that was used for the TL-29 and any SAK that was carried, was to button it up in the top right pocket of our fatigue shirt with a olive drab lanyard just slightly sticking out to grab. If we were around officers or headquarters company, we just shoved the lanyard down in the pocket until we got out of there, and back in the field to whatever project/construction site we were on.
In civilian clothing, we'd just drop it or the MIL knife in the jeans pocket. It rides there just fine being about the same size as a two blade jack or stockman.