Jersey's chief medical officer has advised islanders to wear cloth face masks when out in public.
Although there is "limited direct data" on the benefits, Dr Ivan Muscat said there are "good theoretical reasons" to believe cloth masks are helpful.
He stressed masks are an additional measure, and islanders should still practice social distancing.
The US Centre for Disease Control recently updated its guidance to include cloth face masks.
The lead of the World Health Organization has released an interim report on their use.
The new guidance from Jersey's government advised that cloth masks should be worn in all public places and should be changed if "soiled, wet or uncomfortable".
Essential workers "may need several masks a day to ensure good hygiene and comfort" it added.
Shops that sell "fabric and sewing supplies" will be allowed to open, so people who want to make masks can buy the materials they need.
Anyone who has symptoms of the virus should still be in "household isolation", the guidance added.
"Having a mask does not mean that they can leave home safely without transmitting the virus to others."