noun
mask cover; face mask cover
A cloth or disposable cover worn over a face mask, often for decoration, extra protection, or to extend the life of the mask.
マスクカバーを付けると、普通のマスクが少しおしゃれに見える。
When you put on a mask cover, a regular mask looks a bit more stylish.
花粉症の時期は、マスクの上にマスクカバーをして対策している。
During hay fever season, I wear a mask cover over my mask as a countermeasure.