I for one would love to have something akin to my winter Carhartt gear with some cool woven scene on them instead of plain, boring, without-imagination black. I'd even be willing to pay a 10-20% premium for it and order it months before the seasons I'd be wearing it in.
The only real place you have cool customization like this still going on with any regularity is sneakers.
I'm not saying you did anything wrong. Just sharing why I think your comment was downvoted.
I think the problem is that you have a thing with no moat. Once you start getting any traction, you'll be hit by the drop-ship and print-on-demand guys who'll lemonize the market. You see this with 'Vaporwave' and 'retrowave' clothing which had a short Renaissance.
The opportunity is for the guys close to manufacturing who can rapidly print out each one and then spend the rest of their budget on marketing (say on Instagram).
Alternatively if you have a big brand, you can pull off stuff like Supreme's Dragon Work set (which I do have) but otherwise it's hard for people to spend because they'll assume they're buying from a fly by night print on demand Shopify site.
That's... an interesting thing to put on your fire coat. I bet a lot of modern departments would love these. They are all about identifying as their individual groups and taking pride in being a team. Aramid is naturally the yellowish color that bunker gear already is but can be dyed, although you might have issues with fumes from the dye being heated in fires.
You could skip bunker gear entirely though and just do a startup making custom jackets like this. The aramaid used for bunker gear is woven so just develop a machine to weave using x number of colored threads and do fairly simple patterns like this. This would beat the heck out of embroidered jackets for teams/agencies/social clubs too and you could even resurrect some historical art like this spider. There's already computerized embroidery, computerized custom woven jackets would be awesome. Forget "ugly Christmas sweaters".
In the past beautiful patterns and designs in textiles showed pride and wealth, now a name sewn on the label does. Resurrecting stuff like this with tech, so that it is affordable to the masses, would be an awesome thing.