To cover any size box with fabric, follow these steps: Measure the height of the box and mark out a rectangle on it. If you have a box with a lid, try covering both the bottom. Transform your plain cardboard boxes into stylish storage solutions with a touch of fabric magic! Whether you're looking to upcycle moving boxes, create custom organizers, or add a personal touch to your home decor, covering cardboard boxes with fabric is a versatile and rewarding DIY project. This. Stitchin' Post was founded in 1975 by Jean Wells in Sisters, OR. Jean, and her daughter Valori, still own and run the shop as a maker's mercantile offering quality supplies for many crafts and fiber arts. Here, she demonstrates how to make a pattern and cover a square box.