The WWF has launched a campaign encouraging people to wear sweaters instead of turning up the heat in winter. (iStock)

People across Canada may see a surge in Mister Rogers and Bill Cosby look-alikes on Thursday because of National Sweater Day.

The national campaign, promoted by the World Wildlife Federation, encourages people to lower their thermostats by three degrees and put on a sweater if they get chilly.

If every Canadian turned down their thermostats by that much in the winter, it would save 2.2 megatonnes of carbon dioxide each year -- the equivalent of taking 350,000 cars off the road, according to the WWF.

On Twitter, people paid homage to their favourite sweater-wearing celebrities.

"Happy National Sweater Day everyone," tweeted @kevinfortorcent. "Please pause to give thanks to the patron saint of sweaters, Bill Cosby."

"I will be wearing one--and listening to Weezer," tweeted Industry Minister Tony Clement, who is apparently a fan of the alternative rock band's classic hit Undone (The Sweater Song).

Twitter users also discussed what kind of sweaters they'd be sporting for the event.
 
"In the spirit of National Sweater Day, I will be wearing a wildlife scene sweater," tweeted @kurstmckelv. "The animals include elk, geese, and bobcat."

"I'm going with a heavy magenta cardigan ... how about you?" tweeted jeanninestamand.

Will you be suiting up for National Sweater Day? Send us pics of you in your favourite (or least favourite) sweater. You can upload them here, share them with our Flickr group, or email them to yournews@cbc.ca. You can also tweet us @cbccommunity.