Focusing on material:
* Non-woven: This refers to materials not made by weaving or knitting.
* Natural: This contrasts with synthetic textiles.
* Leather: This is a material distinct from textiles.
* Metal: This refers to a completely different category of materials.
* Plastic: This is another distinct material category.
Focusing on the manufactured object:
* Non-fabric: This emphasizes the absence of woven or knitted material.
* Non-apparel: This refers to items not related to clothing.
* Raw material: This highlights the stage before textile production.
The best antonym for "textile" depends on the specific meaning you want to convey.