Hiking shoe laces, Atwood Rope Mfg. 3/32" 4 strand core & 3/64" micro cord.
Unused power tool lanyards for hefty lights.
As long as they're comfortable.
Example: https://budgetlightforum.com/t/-/69875/48
and
Obviously, there's a lot more cord in one of those 4 strand packs so I have used it for other things like support lines to string up lights in the yard.