What is a good, noticeable, signature accessory?

You know how Darren Criss has pink sunglasses, and Miny mouse (just an example) always wears a bow..? Well I need a noticable signature accessory that you don't really see people wearing everyday.. Like ONE thing.. Different colors to switch it up sometimes.. But not like a headband or a scarf.. Those are two common.. I like the 60's/50's fashion if that means anything..