Take a tape measure and carefully measure the exact spot where you want to place your custom cushion—for example, a bench. Note down or memorize the length and width (e.g., Width 20 inches, Length 70 inches).
If your cushion is trapezoidal in shape, measure the maximum length and width; you will need these for your order. Later, in the personalized order form, you will specify all the dimensions: you will provide two length measurements and two width measurements (top and bottom / left and right).