You can take just about any cardigan that's knit in pieces sewn together and make it seamless. Cast on the number of sts for the back and fronts to one needle (you may want 2-4 sts less that would normally be used in seaming) and knit in one piece to the underarms. Then you do the back and fronts separately, following the shaping instructions for them. You can also knit the sleeves in the round to the underarm as well.
sue- knitting heretic