Step 1: Remove your sofa cover from its cushion (if it isn’t already) and fasten velcro to the slipcover. If your fabric is thin and prone to slipping, add several pieces of velcro in the middle, as well as the edges (if you have thick fabric, you may only need to add just one strip in the middle). Step 2: You now need to line the arms, back and bottom of the sofa (the three areas most prone to slipping) with a few lines of velcro. Step 3: Place the slipcover onto the sofa – if you’ve added velcro along the edges it should slot into place fairly easily.