This is the same stitch used in Purl Bee’s Grecian Rib scarf, but the version of the stitch I found in; Mildred Graves Ryan’s, The Complete Encyclopedia of Stitchery, recommended using two different needle sizes. I found this gives the stitch a much more open feeling and showed off the colours in the yarn beautifully. Do some swatching with various needle sizes and choose the one you like best!