I did dye some t-shirts last year using a pleated tray fold with the dye poured on top. The resist worked in a lovely way, producing the expected idea of stripes. Looking at this piece from Flickr, though, i find myself thinking of breaking up the stripes by clamping a physical resist over the pleats in a sort of “smocking” fashion. The alternate clamping would be an additional resist, so the stripes would be broken up into blocks.
Just a thought….