Katja became close friends with Rosselini's wife Ingrid Bergman, and named a blouse after her that became a fashion hit.

[3][4] She was the designer for Arthur Sportswear which used contractors including those in the Bronx which employed 50 seamstresses turning out her products.

[2] In 1975, they moved back to New York City, where Katja began designing home textiles, bed sheets, and kitchenware.

"Katja shops" opened up in Macy's department store and Cannon Mills manufactured her designs under license.

Katja's clothes are now part of the permanent collection of the Museum "Kulturen" in Lund, Sweden.