Vertical Buttonhole
From KnitWiki
The vertical buttonhole can be knit to whatever size is desired.
[edit] Method
Work to desired buttonhole location, attach a second end of yarn and work the remainder of the row with this yarn, creating a second piece. Work the two pieces flanking the buttonhole independently until it reaches the desired length of the buttonhole. Rejoin the two pieces, drop the other yarn end, and work as one piece again.
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