Paris in Heidi's/Kim's/Grammie's Coat

The coat Paris is wearing in the picture dates back to approximately 1966.  It was originally made by Paris's "Grammie" for Heidi's oldest sister, Kim when she was 4 years old. It was passed down Heidi when she was about 4.

What is even more interesting is the material came from a coat that Grammie used to wear when she was first married.  She cut her coat up and made a coat for Kim for Easter Sunday.

When something is that old, is it considered an antique or do we simply label it an "heirloom?"