Hemingway wrote standing up to avoid the gut. Capote wrote with a notebook and pencil, either sitting or laying down. Stephen King sits at a desk, behind a closed door, loud music on.
I write in pajamas, because once I'm showered and dressed I want to go out.
Sitting in my comfy, squishy, writing/thinking chair.
First with pens on loose paper, then on the laptop.
Completely isolated. Door shut. No phone, internet or music.
How do you write?