I'd either add an extra stitch or two to pick up (probably 2) or you could knit the band right in. Either make a garter band on each side, or if you don't think that would look good, make the band width in st st since that would look best, make a p line for a turning row and another band width. You could then fold it over and sew it down. You'd have to make a buttonhole on each piece of that side of the band and sew them together. I'm about to have to do this on a sweater for a double band that will be added on, so that's where that idea came from.
"Trust the pattern!"
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IngridKH on Ravelry