I have tried the silk, but really prefer the Patagonia Stretch tights. I find that the silk bags at the knees and ankles. Perhaps if they made more sizes or at least shorter ones I'd be better off.

I like silk better than most other fabrics available, but it's hard to find in children's sizes. Perhaps a survey of your clientele would reveal whether or not there is sufficient interest out there in the marketplace for a children's line. It would be much more convenient for those of us who chose to take the entire family on outings.