Woolmark discusses clinical research involving superfine Merino worn next to skin by people with eczema. Its account focuses on very fine fibres and the way wool can buffer moisture and temperature around the body. That is more specific than claiming all wool garments provide the same experience.

Superfine Merino Trials Explore Clothing Comfort for Eczema

The findings do not make clothing a substitute for prescribed eczema treatment or individual clinical advice. Fibre diameter, seams, fit and the person's own response still matter. The textile lesson is that a broad material category can contain constructions with substantially different next-to-skin comfort characteristics.