Forgive me if I've posted a thread like this before, but I notice that most clothing has little doodads and tech looking greeblies on it and I am always wondering what some good ideas of what those could be. I am mainly talking about clothing but I know that some of the clothing is classified as armor as well. What I am looking for are things like passive comlink antenna repeaters, equipment interface chips, clothing repair circuits, etc.
What are some of the uses and purposes for those things besides the obvious reason that it makes it look futuristic?