Once an item is in a space, much more than just it’s shape can have an effect on how it fits into the room. Color, texture, and patterns can have a dramatic impact on whether or not the piece “just works” or not.
Do you want your sofa to stand out or blend in? You could choose a color that matches others you already have in the room, ensuring the new item fits right in. Or, you can choose a brighter shade, either in the same color or a completely different color to create a bold accent. The downside? It will be more difficult to redesign around later. Then there are patterns. Larger sofas look good in plain or textured fabrics with no pattern. But smaller sofas and chairs really pop with a pattern.
Last but not least, when choosing both colors and patterns, take the shape of the furniture into consideration. If you’re upholstering an item with soft, rounded corners and curves, stick to a solid-colored fabric. Patterns with distinctive direction often don’t follow the shape of those items well. But squared-off items with sharper edges will often work well with even repetitive patterns.