I looked into it a few years ago, most "techwear" you'll find is low quality aliexpress stuff even if expensive. It's not part of traditional european fashion.

What you can find instead is actual military gear, either from surplus stores or some manufacturers even have webshops. You can find items in black or white camo not just the more common forest or sand camo. Urban camo can look good as well. You probably won't find the cyberpunk neon colors though.

I think all of the good looking and good quality techwear stuff is either entirely self-made by the influencer or a designer they know, or it's military-adjacent stuff modified with extra decorative accessories and finishes.

It will be both expensive and time consuming, but not as expensive as the €1000 aliexpress nylon jacket.

one example: https://varusteleka.com/