Just 9 years old, Kamryn Lambert was a miniature fashion diva known among her family and friends for her love of funky pajamas.

The Pasadena girl, who died a year ago today after a three-year battle with leukemia, had at least 30 unique pairs, her grandmother recalled.

"She was a real princess sometimes," Debbie Katzenberger said. "When she was staying in the hospital, it would always make her feel better to get a new pair of pajamas. It made her so excited."

Now, Kamryn's flair for fashionable nightwear lives on, thanks to Kami's Jammies.

Founded in February by Ms. Katzenberger, the charity collects pajamas and...