I am going to use 26/2 cashmere as the weft. Maybe 48 crammed and 24 open? I am making a scarf so want a fine drape. The warp for the open parts is a painted warp, going for a stain glass window effect.
The sett of 24 ppi might be a little bit dense with the 26/2 cashmere - which - with searching - seems to come in at 6464 yds/ lb. Our linen is 7,500 yds/lb and our 30/2 silk is close to that. The other thing would be that the cashmere will full more than either the linen or silk - and Jane recommends 16 epi for the open areas with the linen. In other words - just saying ...... maybe you should allow for a sample on your warp ;-) It would be a shame to not be happy with the final result of what sounds like a beautiful scarf. Please post photos when you are done!