Dyeing Stretch Fabric with Natural Indigo

Q: Can I use a natural indigo dye vat to dye stretch fabric?

A: It really depends on what you mean by "stretch". The characteristic of the weave or knit is less important than the fiber content itself. You'll get better color uptake on materials that are higher percentage natural fibers, but I've used fabrics that are 50/50 cotton/poly and gotten decent results, about only 50% saturated compared to a full cotton. If you're using something that's like 92% cotton / 8% spandex you wouldn't really even be able to discern the difference in color uptake than with 100% cotton.