The weave on that flax linen is fantastic. It's very tight-knit for something that would be hand-woven. A great amount of time would have gone into that.
In the 200MB (lite!) pdf book they suggest the finest woven objects (and most of the metal-work) were from regional trade not produced locally. And many of the items of the site came from Ireland and some as far away as Iran.
you’d be amazed at the fineness of the work you can get with a drop spindle. Most machines can’t come close.