I'm making some bags, and got mid-heavy weight twill for outside and also for inside.
Do I still need interfacing?
I'm used to using quilting cotton for inside and fuse interfacing, but thought maybe twill is stiff enough not to use it.
It will be a floppy bag once washed a couple of times. The interfacing will help the bag keep its shape. I think it depends on what you are going for. If you are putting pockets on the inside, I think you may want to interface the lining material with a light or med weight interfacing or your pockets will tear when loaded up with stuff. So, in other words, do what you want. There are no rules really for this.
Your bag will look limp in no time. I would definitely interface even if it is a twill. Many's the bag I've made of upholstery fabric, quite heavy, and they were always interfaced. If you don't want a stiff look to the bag use fusible fleece. -- Edited on 12/27/12 9:43 PM --
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Fabrics and more... >> Do I always need interfacing?