The Chameleon Bronze Cloth is the cloth of the Saint June in Saint Seiya, and by an unknown Saint in Saint Seiya: The Lost Canvas. It is of the lowest class of the cloths that Athena’s Saints wield, the Bronze Cloth.
The constellation of Chameleon was a modern constellation developed after the times of myth. While no myth exists on the constellation, it was based on the lizards who were known to change colors for defensive camouflage.
June trained to be a Saint on Andromeda Island, along with Shun under the Silver Saint Cepheus Daidalos before the start of the series. The cloth was likely kept in this area by Daidalos to be given to her once she proved she was worthy to be a Saint. Although it is not shown when she earned it, she was still a trainee when Shun earned his Cloth and left.