Question

Why was calico act came to be known as calico act

Answer 1

The Calico cloth was referred to the cloth made in Calicut. 
The Calico Acts were passed in 1690–1721. They came into being mainly because of the threat caused to the domestic English textile industry from the Indian and Chinese textile imports. 
The Calico cloth generally referred to the printed cotton textiles – chintz 

Answer 2

The protest of European traders against Indian Textiles in Europe was kbown as calico act.

Calico was a prominent cotton textile in Europe.

So the act was called "Calico Act"...