sheet of material bent round you wear it as a bride or groom a ding from a bell or circular shapes in trees

A creature inspired by bar codes and crosswalk and yet people still assume I'm just a painted stallion.

Tread in the tulips, Nice and light, Swan lake style, Add some height

I am small, prickly, and come with many. Worn on legs, sometimes on arms, my siblings and I are here to protect our wearer. Lose the first and I'm large, lethal and come in pairs. Worn on heads, sometimes on noses, here to be a weapon and protect our bearer.

I'm where the Sun goes down to sleep I inspire sailors to sail waters deep