Someone in a suit at a car boot sale. Full evening wear on public transport. A child in fancy dress in a supermarket. Formal clothing at an informal event and vice versa. The clash between what someone is wearing and where they are produces instant visual tension.

Watch for: treating people as props. The picture needs affection, not cruelty. There's a difference between finding something funny and making someone a punchline.

The point: clothing is costume. Everyone on the street is performing something. Sometimes the performance is clearly wrong for the venue, and that's the picture.