Cash Iroha is a tricky yarn. Its thick, then its thin, then thick again. Maybe its supposed to resemble handspun. Whatever the reason, it does not make a great edging. I know, because I tried a number of them..
I looked for an edge treatment that could be applied uniformly to all edges of this nearly-finished sweater: sleeves, neckline, and bottom hems. Since I started with the provisional cast on, there are live stitches to work with.
My original thought was to let the edges roll. However, I wasn't thrilled with how this looked at the neckline, and what with the marathon over and all, I had time to take on the find-an-edge challenge.
Applied 2-stitch i-cord.
I thought this might be most similar to a rolled edge, but cleaner. It did look really nice on the sleeve edges, but along the neckline, it looked strange. Not the one.

Kitchener 1x1 rib bind off.
This had strong potential to look very clean and even, but the thick/thin nature of the yarn yeilded a messy edge. I tried a couple different versions, binding off after 1, 2, or 3 rows.

Nope. The normally very clean Kitchener bind off looks ragged in Cash Iroha. Hourglass v2.0 should be more refined...
Kitchener 1x1 rib bind off in Cotton Glace.
Faced with 2 failed methods, inspiration struck in the form of Cotton Glace. What about using a different, smoother yarn for the kitchener bind off?

It turned out too loose-looking. Maybe a smaller needle size, or maybe...
Mini-hemmed edges in Cotton Glace.
Inspired by both Lori's contrast-trimmed hourglass and the mini-edges on the Union Square Market Pullover from the Fall 05 IK. I worked six rows in cotton glace, then folded it over and sewed down the live stitches. This could totally work.

Compared to the kitchener rib bind off, its no contest.

In an extreme stroke of yarn luck, the LYS had a shade of cotton glace that matches the green much more closely than the one pictured, which was just scraps leftover from my summer crochet bag. It is still a different shade, but in a subtle and intentional way.
Hourglass the second is getting there... Today I am on the search for some elastic to thread through the hems. Cross your fingers that it works!