What's wrong with this picture?

 The customer could have gotten lots more wear out of these cushions.  The welt has worn out from inside because the welt was made with hemp cord.  The "wavy" effect you see on the seams is because the fabric covering the cord was cut on the straight of the fabric (parallel to the selvages) instead of on the bias.  Bias cut strips for covering cord are well worth the effort.  Trust me.