Recommended: Mohair
Mohair yarn is generally available to purchase all around the world, and can be found in all price ranges. As you work with 10 strands of yarn held together, the sweater will be extremely heavy if worked in heavier yarns, which will pull the garment out of shape. I definitely recommend knitting with mohair/kid silk mohair for this project.
The best alternative: Brushed Alpacca
If you prefer working with brushed alpacca, this is a great alternative to mohair and should work very well for this pattern.
Another alternative: Blowyarn
As this garment is worked with 10 mohair strands held together, you do need a ton of yarn skeins, which can easily become expensive.
If you prefer, you can opt to replace 4 of the 10 mohair strands with one strand of blowyarn, with meterage 110 meters pr. 50 grams. Meaning you would work with 6 strands of mohair held together with one strand of blowyarn, instead of 10 strands of mohair.
This option has been tested and is definitely possible, albeit the sweater will be slightly heavier and a little less fluffy.
