Smooth Transition to Ribbing

If you want to create a smooth line for ribbing when knitting a top down sweater, on the last round before the ribbing, change to a smaller sized needle which is usually 2 sizes smaller than the body of the sweater. Work one round of the body stitches (stockinette or pattern). On the first round of ribbing, SLIP every knit stitch and purl the purl stitches. On the next round, knit the normal ribbing stitches to the desired length.