You seem to be over thinking it. If you feel you cant think of what to wear, put on a multi coloured afro wig, 6 inch stilettos, leopard print swimming trunks and off you go. In other words, don't think about it too much. just dress like you normally do so you are comfortable in what you have on. And if you normally wear a multi coloured afro wig and stilettos, forget that and go in jeans and t-shirt.