I wondered what to do to stop my evening bag sagging. I had made the bag from a sequin front top in size 6, which I consider child size. Both the bag and the flat ribbon straps needed support. Firstly for appearance. Secondly for durability. Advantages of Interfacing It wasn't long before I discovered the answer was interfacing. This fabric, looks like stiff off-white netting, if you order white, but websites also offered me black. Occasionally it is used only as a second layer of lining. Interfacing Colour Choices The backing in white is clean and fresh and won't dirty or darken light or pale patterned top fabric. Black is less obvious and intrusive inside a black bag or belt or rucksack (backpack) and won't show the dirt. However, as the the name suggests, interfacing is not just a backing but usually an intermediate layer, like stiffer padding sandwiched between, for example, a woven jacket with a silk lining. Why Interfacing Helps You Make Handbags And Clothes Inte...