Combining square and rectangular cushions
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Mix cushion shapes by their role on the seat rather than adding different sizes without a plan.
Plan the layout and dimensions
Use the largest square cushion as a visual starting point and place a smaller rectangular one where it will remain reachable and useful. Check the sofa’s seat depth before stacking several layers. A deep seat may accommodate a different arrangement from a compact chair. Compare the cushion dimensions with the backrest height so the proportions do not overwhelm the furniture.
Check everyday use before ordering
Choose one connection between the fabrics, such as a shared colour or texture, and vary only a few features at once. Turn the arrangement into a practical test: sit down, lean back and stand up without moving every cushion. If the combination works only when no one uses the sofa, remove a layer. Confirm whether each item includes its filling and follow the stated cleaning instructions.