Clothing materials

Its important to distinguish a piece of clothing from it's material. In cases where you have a certain recognizable type of clothing it may be preferable to tag it as clothing:denim jacket or clothing:denim miniskirt while you might as well as just use the namespaceless tag denim for the image. Its up to the tagger to recognize where its better to tag only the material and where he needs to include the material together with the piece of clothing. Typically clothing materials are called fabrics, while some modern artificial materials may not fully fill the latter definition.

https://en.wikipedia.org/wiki/List_of_fabrics

https://www.thespruce.com/fabric-glossary-clothes-you-wear-2145791

External sources are not all-exhausting. The wikipedia article for example doesn't list a fabric that's gaining popularity called rayon. Rayon is synthetic silk.