The invitations you send out will let everyone know the theme of the party, so stick with the color scheme. There are many great options for black and white party invitations. Here are some ideas.
Choose a basic black card on thick paper with white script if you want more dressed up.
For a little bit less formality, send out invitations with an elegant pattern or clipart image.
For a true nod to Capote, select a style with vintage flair whether it's original cards or a nice graphic.