Pink was also covered by red. I believe the name for pink comes from the plant group Dianthus, which includes carnations. They were a popular adorment worn by men on their suits at weddings for a period of time, during which probably made the colour reference familiar to most people and then became the norm (Hopefully that's all correct, that's what I understand at least!).

There also exist 'pinking scissors' for cutting those trianglar jagged edges to fabrics. The term 'pinking' refering to the Dianthus flower petals that have a jagged edge.

So pink was a shape rather than a colour originally!