long dresses for weddings

Local friends and crafty folks. I need help designing a peacock themed costume for Gracyn and a horse. Looking for battery operated light kits and it's of feathers. Maybe even a cheap xs women's homecoming dress we could decorate with tail feathers. Maybe a Mardi grass type mask or headband with feathers. I also need a large cape for the horse to wear that we could attach tassels or feathers and lights to. Anyone have supplies they aren't using or fabric we could use? Extra tutu tulle? long dresses for weddings