Usage patterns
〈物〉に飾りをつけるto add decoration to something
I added decorations to the cake.
飾りを外すto remove decorations
Since Christmas was over, I took down the decorations.
飾りのない〈物〉a plain, undecorated thing
I like a plain room without decorations.
Expressions
飾り気のないplain; unaffected; natural; unpretentious; frank; candid