Ha! You can tell mine's real - badly tied and getting a bit frayed in the middle
I cracked this years ago.
Tied one properly and decently, slid the adjusting buckle to maximum length, took it off over my head and then put a couple of stitches though the back of the knot.
I now put it on and off over my head and slide the buckle to fit!
Its properly tied and looks like it, but I don't have the bother.