Oh I much agree, the cords definitely add something to the fancy and ceremonial nature of the sexy uniform. For me it's the professional neck tie, dress shirt, and uniform blazer combo that really does it.
You're in luck though, I've commissioned several customs like this one on lady2fight (see below). They might not be quite as zako-focused as many on this forum might hope, and they're more about the girls taking hits to the belly, if you're OK with that. There are a couple of scenes with the girls marching in place before getting attacked, if that suits your tastes.
It's really a mix of 2 fetishes (the uniforms and belly punching) - as you might imagine this is a niche that's a bit hard to satisfy lol.
[URL unfurl="true"]https://lady2fight.com/product/belly-punching-stories/[/URL]
[URL unfurl="true"]https://lady2fight.com/product/belly-punching-stories-part-2/[/URL]
[URL unfurl="true"]https://lady2fight.com/product/belly-punching-stories-part-3/[/URL]
[URL unfurl="true"]https://lady2fight.com/product/belly-punching-stories-part-4/[/URL]
Having said that, you ask at an opportune time as I've also recently commissioned a bigger, more zako-like battle scenario from them featuring many more girls. They actually just filmed it the other day and it's in editing stages, so it should drop any day now.