I've been reading a book that outlines most of the modern shooting sports albeit with a "glock" slant. It's titled "The Glock in Competition", by Taylor, Carver and Passamanek. The shooting games sections aren't so glock centric in case you're interested and don't have a glock. The section on IDPA talks about basic equipment you need. They mention some sort of "concealment garment" like a photographers vest? What else qualifies around here? Is this still a valid rule?