Not at that table.

"Canvas. JC Penney, $3.98."

But the question was..what did they plan on tying his gi up with, not the moral standards of Miyagi.
If those pen pushers up at city hall don't like it,well, they swivel on this middle digit!

MiyaGAY steals building materials and money from the maintenance fund from the crappy apartment complex where he pulls down a salary for doing mediocre "work"..he has no problem with stealing a belt that belonged to someone else. I mean, he stole the anal cherry of an obviously underage boy who needed a father figure..

If memory serves, Miyagi took it from the ref's gym bag

Because they sell stuff like black belts at tournaments

They might have brought a lower-ranked belt, e.g. white, since Miyagi wasn't aware of the tournament rules.
But didn't Miyagi grab the belt from a box of them? That was odd. All the tournament entrants would already have belts, so why would there be a box of them on the table?
Fowler's knots? Did you say fowler's knots?