If you want it to be fast, then basics are the right thing for you. With basics you will usually be right, but you won’t be noticed either. Jeans, T-shirt, sneaker – these are great basics that will get you through the day. In order not to be completely run-of-the-milll, you can focus on the T-shirt by making a statement there, for example with a fancy color or a striking print.
If you want to stand out a bit more, but orientate yourself on basics, rolled up trousers with crazy socks are a great alternative. If you change your mind during the course of the day, just roll your trousers down and you have a full basic outfit ready to dive into the crowd.