In celebration of World Kindness Day yesterday people all over the country donned their best cardigans in honor of the unofficial "king of kindness," Mister Rogers.

Check out the moment when Fred Rogers' wife Joanne was welcomed to Pittsburgh Magee-Womens Hospital by staff who sang the Mr. Rogers' opening theme song.

A local public TV station in Rogers' hometown of Pittsburgh, PA even created an off-shoot of the holiday called "Cardigan Day" to honor the TV personality. Residents were encouraged to "express your kindness by showing off your cardigan and sharing it with the world," according to WQED's Cardigan Day event page. Some people even got their pets in on the action!

The award for the cutest cardigan wearers has to go to the hospitals in Pittsburgh whose staff dressed newborns in matching outfits to celebrate their hometown hero and his iconic get-up: a red cardigan and a tie.

While the hospitals have dressed up the newborns before (there's a running tradition of wrapping the babies in yellow and black "Terrible Towels" when the Pittsburgh Steelers are in the playoffs), this is the first time they've worn the Mister Rogers attire.

"We wanted to join in the spirit of kindness with our most adorable ambassadors, our newborn babies," Stephanie Waite, a communications advisor at Allegheny Health Network, told USA TODAY .

Rogers was born in Latrobe, PA and lived in Pittsburgh for most of his life, including the entire time his show, "Mister Rogers Neighborhood," was on the air. He passed away in 2003 from stomach cancer. A film about his life, "A Beautiful Day in the Neighborhood," starring Tom Hanks is set to be released later this month.

Rogers' wife Joanne (pictured below) was all smiles as she admired the newborns at UPMC Magee-Womens Hospital, all dressed in her husband's signature outfit.

"Mrs. Rogers kept telling us how much she loves babies. She got a real kick seeing them dressed up as Fred," UPMC spokeswoman Amy Charley told Fox News . "Mr. Rogers is an iconic Pittsburgher and a lot of the values he represented overlap with the values at UPMC Magee."

The outfits were made by a nurse at the hospital and families got to take them home with them. We're sure the new parents will always remember this day and the power of kindness, thanks to the guy in the red cardigan who started it all.

How did you celebrate World Kindness Day? Sign up and sign in to tell the world about it. Let's #StartSomethingGood together.

(Source: images & video UPMC Magee-Womens Hospital Facebook )