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Another example of how different fabrics turn out different colors.
Both were in the same dye bath. The shirt is a cotton knit, while the square is a silk weave. Silk can be dyed with fiber reactive dye, the type of dye you use for plant fibers. But the dye reacts differently with silk. It's still a pretty color, you just have to know it'll be different.
Also, both were stitched up as the Mokume Shibori technique. But the silk just didn't compress like the cotton. I think partly because the shirt is a knit and is able to be compressed more. And partly because the cotton threads ore a bit thicker. If I want to do a silk scarf with a stitched resist, I'll have to sew it the long way, rather than the short way. Otherwise the pattern just doesn't show up as much as I'd like.