There have been multiple news articles suggesting that in the current Corona virus pandemic wearing a mask, even if it is just a fabric one rather than a medical one is actually better than not wearing one at all.
I have designed a range in all of my current prints which are available in three sizes to fit both kids and adults, these are made from jersey with a wadding inside and elastic to go around the ears. These are supposed to be a bit more fun and less scary to wear than a plain one. These are made by a UK manufacturer.
Please check the listing for size details.