Best combo would be to add some non-neutral colours to allow the outfit to pop out. To combine with peach I would suggest to try the blue palletes or some neon/pastel combo. I have a great experience with the fashion department so trust me. If you would like to try the outfit idea then the best way to add the colours to the outfit would be the jewelery, shoes and a bag that includes the peach and the colour of your desire. So good luck and rock that graduation!!!!!