With or without an i-cord?
On my shawl pattern Emilinda Aurora, I give you the option to knit an i-cord on the bobble border. Hopefully this post will help you figure out if you need to knit it or not.
After blocking my gray sample, the border remained flat for a while. But after 4 or 5 days of wearing the shawl, it began to curl! It doesn’t bother me at all. You can still see the bobbles and the shawl is very comfortable. However, the photos might be misleading and that is why I decided to knit the rusty version.
The border will still curl a bit, but the i-cord will tame it a fair amount and the bobbles will stay on the uncurled part of the border.
The i-cord is knit at the same time of the border, and you will only be knitting 3 more stitches throughout. I explain how to do it on the pattern.
One of my test knitters opted for purling the stitch right before the i-cord on the right side and knitting it on the wrong side. This option should help it further. You can see how it looks on her project page on Ravelry.