Measure the furniture arrangement
A dining set covered as one group needs a different plan from individual chair covers. Include the highest point, outermost corners and any projecting arms or table edges.
Plan the way water leaves the cover
Fit, support and placement matter alongside the fabric. Low areas can collect water; discuss the shape and clearance rather than assuming a cover will solve pooling on its own.
Think about removal and storage
A cover should be manageable for the person who uses it. Discuss fastening, access and where it will go when the furniture is in use. Let furniture and cushions dry before enclosing them.

