a black tech belt
A nice simple belt.
I found the Korean manufacturer that had the patent on 2016 Arc'teryx pant buckles and had them fire up the machines.
I always wanted the belt that comes sewn into Arc'teryx pants and never had the nerve to cut it out of the pant.
4 lengths... OK this one you need to do a bit of math for.
But the math is easy, just measure the total length you want. Do you want a long belt dangle or short an neat? It's up to you really.