I make my own gear, and have a small gear making factory in the basement. It is expensive, frustrating, and time consuming. If you are just wanting a certain piece of gear, then just buy it. You'll be money ahead, and much time saved. On the other hand, if you want a hobby and are dedicated enough to push through the frustration in learning a new set of skills, then by all means, do it.
DIY Tactical is a great place to start learning. Lots of very helpful folks there.