OH okay, so it's this style of bag. Now that I can actually see it, I totally get how the corners work.
I'm pretty sure it would be possible to do the twill tape thing with it. You'd have to turn the bag inside out, and you should be able to use a single length of twill tape. You'd have to pin the twill tape in place on only one side seam, and then topstitch through it all from the outer side of the bag while the bag is inside out. When you get to the corners, you can stop - or even stop slightly before the corner. Tack your stitches, pull it out of the machine, then pin the twill tape along the bottom and resume the topstitching along the bottom. Stop when you're about to the other corner, pull it out again, and then do the final side. The way I'm seeing it is that you probably won't be sewing the twill tape down at that corner, but letting it gap slightly and only worry about the straight seams.
It doesn't really matter that you'd be leaving a slight gap in the tape at the corners, because you'll just be doing that perpendicular stitch so you can fold the corners to the inside anyway. The corners don't need the reinforcement of the twill tape. But if it bugged you and you really didn't like leaving the little gaps of the tape there, you could tack the twill tape to the fabric after the fact (like, if you're worried about little things being caught there and you wanted to close the gap).
The whole process of sewing something from the inside is kinda weird and awkward, but I've done it many times. I've even sewn tube-type shapes from the inside. You just have to take it slow so you can keep control, and every so often may have to stop sewing, rearrange the item under the presser foot, and then pick up where you left off.
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timeasmymeasure
Re: Pictures linked
Date: 2013-10-19 04:05 am (UTC)I'm pretty sure it would be possible to do the twill tape thing with it. You'd have to turn the bag inside out, and you should be able to use a single length of twill tape. You'd have to pin the twill tape in place on only one side seam, and then topstitch through it all from the outer side of the bag while the bag is inside out. When you get to the corners, you can stop - or even stop slightly before the corner. Tack your stitches, pull it out of the machine, then pin the twill tape along the bottom and resume the topstitching along the bottom. Stop when you're about to the other corner, pull it out again, and then do the final side. The way I'm seeing it is that you probably won't be sewing the twill tape down at that corner, but letting it gap slightly and only worry about the straight seams.
It doesn't really matter that you'd be leaving a slight gap in the tape at the corners, because you'll just be doing that perpendicular stitch so you can fold the corners to the inside anyway. The corners don't need the reinforcement of the twill tape. But if it bugged you and you really didn't like leaving the little gaps of the tape there, you could tack the twill tape to the fabric after the fact (like, if you're worried about little things being caught there and you wanted to close the gap).
The whole process of sewing something from the inside is kinda weird and awkward, but I've done it many times. I've even sewn tube-type shapes from the inside. You just have to take it slow so you can keep control, and every so often may have to stop sewing, rearrange the item under the presser foot, and then pick up where you left off.