I know what you mean - Thai silk very often has that characteristic, in fact maybe that's what's meant by Thai silk? sometimes called "wild silk", with slubs in it.
I can't comment on its microscopic qualities, but perhaps you could buy some of the cheap silk satin you mention, which will probably be very thin and not that strong, and use it as a lining for the Thai silk. So you have the Thai silk on the outside which will look nice when you wear it, and the smooth but not so strong satin on the inside, which will be supported by the outer layer.
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