When I asked the "ALL THINGS PICCOLO" group if they wear earplugs in just their right ear or both ears, one picc-ist mentioned it was more for the trumpets behind her than the piccolo. 😂
What about you?
I don't play picc frequently, but when I play flute in the upper register - about high A or so - I like to be wearing an earplug or headphones in/on my right ear.