Dave,

OK, this is my third attempt at trying to explain this. You should be able to put the pin through the pocket while wearing the pants, just don't stick yourself. The safety pin goes horizontally in the right front pocket, where the colored pants material meets the white pocket material, and near the area where the pocket meets the side seam. Think of where the coin pocket on a pair of Levi's is located, only farther down, so that the knife doesn't show. The clip on the knife slides through the exposed part of the safety pin, and the knife rides against the right side of the pocket near the side seam. Some people have sewn a "tunnel" in the pocket to fit the knife.