Snagged a random possible chair restoration project (free) down the block. Tough one, no existing cushions. But I still have foam and vinyl for a chair or two here. #furniturerestoration
@ai6yr
If you wanted to be swanky about it, a layer of fiberfill over the top of the foam is nice and will help create a rounded profile.
For thicker cushions I would layer dense foam at the bottom a thinner layer of softer foam, then the fiberfill.