Preferred materials are considered to be the least environmentally impactful, sustainable, and ethical options for textile production. These materials are often made from natural, renewable resources, and are processed using methods that have minimal impact on the environment. These materials are typically more expensive than synthetic alternatives, but are considered to be worth the extra cost due to their positive environmental and ethical impact, as well as longevity and resell value at end of life.

Approved materials may be less expensive than preferred materials, but may not be as ethical or sustainable as Preferred materials in their production. Even when using Approved materials, certain standards and guidelines should be followed to ensure minimising negative impacts.

Discouraged materials may be made from synthetic or non-renewable resources, and may be produced using methods that have a high environmental, animal or social impact. While these materials may be less expensive or easier to work with than other options, they may not be the most sustainable or ethical choices for clothing production, and may be problematic from a traceability and compliance perspective.