What is it called?

[skauwt]

I see these hats in alot of pipe bands, worn by the major. I just don't know what they are called, and I can't seem to find it on the web! Does anyone know?

as others have said ... a feather bonnet, here is a wee site i found explaining what type of feathers are mainly used and it has info on other parts of the uniforms accessories

http://www.epspipeband.ca/about%20the%20band.htm