My client requests something like the title described. I do not agree the initial idea though. As they insist on doing in this way, I had to come here to ask for some help.
Let's put the question like this: how would you approach designing an outdoor banner that advertises (for example) suits, work uniforms, and children's clothes?
Normally design starts with the question: "what is the purpose to show to audience?" - but here, there are three very different audiences. How can I go about coming up with ideas that do three very different things?