Being old enough to have owned and still remember records and record players, it's been a bit surreal to watch the name of the material gradually take the place of the thing itself. Imagine waking up one day and hearing the kids talk about the fashionably distressed "cottons" they're all wearing, nobody using the word "jeans" anymore...

To be honest I'm not a native english speaker, so I might be using words wrong.

You're using the words in a way which has become normal; nobody will mistake your meaning. I'm just observing a shift in the use of language over time which feels strange to me.