"Bahan rok saya adalah katun."

Translation: The material of my skirt is cotton.

[donny309620]

Elsewhere in this unit, "kain" is added to "katun". So, why not "Bahan rok saya adalah kain katun."?

[AnUnicorn]

Would this be a natural sentence in Indonesian, or is it an awkward way to jam "bahan/material" in both languages?