Riff Raff's Vest (Research)

Two shots of the vest - buttoned in different holes. It's a common style and the textured fabric is called pique. The Tuxx Man sells them on eBay for about $32, or you can make one using McCall 4321 (you can also use the cummerbund pattern for Brad). I prefer paint or even nail polish to make the blood stains - but anything would work.

The shot on the right (from The Time Warp) also shows his suspenders.