My spelling isn't always the best.......SILESIA.....usually a poly/cotton material used mainly for pocketing, but also works a a crotch lining, sleeve interfacing, etc.
Thanks for the clarification. Even if you had spelled it right, I still wouldn't have known what it was.
I don't remember whether we got an answer on this question before: does a lining that moves independently from the shell fabric with low friction (like Bemberg) prevent wear better than, say, silesia or fused interlining? I have these theories sometimes, I don't know where they come from, but I'd like to hear some tailors' opinions. Though I don't know if Bemberg would be the most comfortable for the crotch, vice silesia or fusing.