I asked Sig a week ago by placing myself on their notify list. A couple of days later they informed me they had silk.
Other than that there's a product called Chinese Silk. Amazon along with a number of other places carry that one. A good fabric store might also be an option.
Just found a bunch on Etsy. I ordered some to try. Here's the URL:
https://www.etsy.com/listing/1154822184/white-silk-silk-habo tai-5mm-china-silk?external=1&ref=cl_thank_you_recs_list ings-0-listing-0&page_type=cl_thank_you_page
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