This year I have been experimenting with i-cord edgings on a few of my designs, and I would say that overall this is one of my favourite edge treatments. One thing to be careful of, however, is the potential for making the edge too tight - as the i-cord bindoff hasn't much natural give. This is particularly important when binding off necklines. For example, when binding off the neckline on the Kalinka pullover, if you use a standard i-cord bindoff you may not be able to get your head through the opening! So instead I suggest the following method for making an i-cord bindoff more stretchy:
This started out as an instagram video, so apologies for the low resolution. But I think it is still fairly clear?
The first part of the video shows the standard way of working an i-cord bind off. In the second part, notice that I pick up a bar between stitches and bind that off as if it were a stitch (twisting it first) instead of the next ‘real’ stitch.
I work a few of these, evenly spaced, throughout the i-cord bindoff round, and it stops the edge from being overly tight.
For the Kalinka pullover specifically, I worked 10 extra stitches into the neckline bindoff in this manner. But the ideal number of stitches you'll need will depend on the yarn you use, on the pattern, on your tension while binding off, etc. - so you may need to experiment a tad.
Whether you try this with one of my patterns, or a different project, I hope it proves helpful in adding give to those notoriously tight i-cord edges.