On most trips to Asia, I bring back a few of metres of the nicest silk I can find and turn them into shibori scarves. The silk varies from thicker Thai silk to the lightest Indian silk and whichever it is, they make beautiful scarves. Silk is the material that makes the most dynamic use of indigo and the results are mostly spectacular.
Lastly, please note, we are not a big industrial dye house, we are a small backyard setup and as such, we do not achieve perfect results. Sometimes blue gets where it shouldn't and sometimes the large areas of blue are not all one perfect shade. We do not "fix" them by adding colour or bleaching it away when it gets where it shouldn't. What comes out of the vat is what you get. We use natural indigo, not synthetic and try to use organics instead of strong chemicals at every stage.