wear something that will say i am COOL, HOT, SEXY and not here i come so come get me something that will say i am just too hot,cold and warm for you to handle. Dont mind my long talk o, just wear something you are comfortable with
I'd say just wear whatever you are comfortable with. Go with simple & casual. Colour is not important. Just relax & remind yourself that you are there to get to know each other better. What do you think your date should wear? Would you really care that much if you are into him?
Official or unofficial date? Well a lot depends on where and when you are going on the date. But the buttom line is to be neat and smartly dressed. Wear what you are comfortable in. Colors are also important.