Recently, I test knit a corrugated rib hat for Amy. Corrugated ribbing is ribbing with the purl sts in one color and the knit sts in another.
Since I'd never done any corrugating ribbing before, I searched the web for info. Here are my adventures in making the hat:
First comes the supposed problem with curling and with strands peeking out from the edge. After a few attempts, I ended up with a knitted cast on (though a single cast on would work as well, and also, I suppose, a cable one).
Then, more importantly (to prevent curling), I did one round in k1p1 ribbing with the same color -- dark gray.
After this round, I added the second color. I tried having the purl color in my right hand -- but found it very difficult for me to purl English style. (I generally knit Continental style.) So, I ended up with the purl color (white) in my left hand and the knit color (dark gray) in my right hand. It worked out well -- and was surprisingly relatively fast and easy. The second picture shows both the right and wrong sides of the hat.
I used Patons Classic Wool Merino and size 7 needles. There is no problem whatsoever with curling and my DD has a nice warm stylish hat.