Can I walk in and buy Hermès?

Excuse me, I was wondering if I could simply walk into the store and purchase a Hermès item right away? I've heard that their products are quite exclusive and I'm not sure if there's a specific process or requirement that I need to follow in order to make a purchase. Would it be possible for me to just show up and buy an item, or is there a reservation system or waiting list that I need to be aware of? Thank you for your help in clarifying this matter.