I searched and searched for the perfect little hat to go with the "Offset Wraplan". I considered the "Norwegian-sweet-baby-cap", but it is written for fingering weight yarn and my brain wasn't wrapping itself around the conversions needed for it to work in the DK weight yarn I had chosen for the sweater.
The numbers for Elizabeth Zimmerman's Ganomy Hat worked perfectly when I used DK. I just shortened up some of the length and fussed with the final decreases a bit to make them work on the smaller version.
And I think it's quite in keeping with the general style of the sweater it is meant to go with.