What do I need for My Cayuga Mix Pet Duck,as far as Diaper

[BackSwampGirl]

I want to put her in the fair.But what all do I need to put a diaper on her.I want her to look very pretty.Which she is adorable,already.A saddle,Please advice.And where is a place to get this for her.She is a Black Cayuga/Rouen Mix.But I have never bred her.Thanks