A. While any of the diagonal ‘tent’ stitches can skew your canvas to some degree, you’ll do best to use the basketweave stitch wherever you can, and continental stitch whenever you can’t. Avoid half-cross stitch (which also provides poor coverage). Use stretcher bars or a scroll frame to help keep your canvas square. Blocking your finished piece can correct some of the twist, but a badly misshapen piece may need repeated blocking.