Describe your ideal first date; Where do you go? What do you wear? How does the date end?
On a first date we go and grab a coffee in a shop and talk about stuff we like, and then based upon mutual interests plan an outing then and there. Clothing should be normal, plain enough for every day to set a standard of how things are. Plus, whatever you go out and do, you should be willing to do it in those clothes, so suede isn't the best if you say you're going to the zoo.
Afterwards..what will your date know about you?
She'll know what I like, what I'm like, and get an idea of how well I get her.