I made a map pocket using a zip and nylon cut from a cheap rucsac I bought off the market. It later got recycled first as a cycle tool pouch, then a bumbag. A couple of the pockets from that rucsac are still in use as a washkit pouch and a compass case.
I have a homemade sun hat that's better than anything money can buy. My hat of preference was a knotted hanky, but one day I decided it would be more convenient to sew the hanky into shape permanently, and dispense with the knots. It's cooler, lighter, more comfortable, more wind resistant and smaller to pack than anything you can buy.
I once modified a pair of polycotton walking trousers into zip-offs, and altered another pair for use as cycling trousers. I also made a small lightweight rucsac. I have two or three that pack down into their own pockets, but this one is much smaller and lighter because it's made from fabric cut from an old cagoul. It just needs to hold a waterproof, sandwiches and water whilst sight seeing.