I am looking for a children’s book written between 1940 and 1965, for ages 10-12 years old. It is the story of a family that moves from a house to an apartment, I believe in New York City, and the children find a hidden room in the apartment behind a blue or pink chest. It may had a few illustrations in it. Also, the mother sews their clothes and makes matching outfits for the boy and girl. I read this book just when I moved to a new school, in 1967, and really hope to find it!