skin or leather
Book Review: Natural Leather Tanning by Markus Klek
The Arrow Quiver of the Iceman Reconstruction Attempts and the Special Significance of the Fur Material
Birch Bark Glue and its Potential Use in Neanderthal Clothing: A Pilot Study
Book Review: Determining Prehistoric Skin Processing Technologies by Theresa Emmerich Kamper
The Construction of a Skin-on-Frame Coracle at Kierikki Stone Age Centre
The Construction of a Skin-on-Frame Canoe at Kierikki Stone Age Centre, Finland, as a Medium for Group Training in Ancient Skills and Experiential Learning
From Gastonia to Gotha: My Thoughts and Impressions on doing Museum Work
Leather
Tanned skin of an animal, for example as used for clothing.
Could they already weave textiles in the Iron Age (NL)?
Absolutely, textiles are already known from the Stone Age. In these areas, little is found (in sandy soils, this is not preserved that well), but there are many clues, like weaving weights, belts and pins et cetera. The surely still used animal furs but textile was in well use. The value of it was much more than today, however...