I’m making a little sweater for my dolls. How would I get ^the sleeve to attach to the front & back of the sweater? I’m making a little cardigan, so the front and back will be in three pieces. Would I pick up stitches there? And how would I make the sleeve round? Would I knit in stockinette st across where the shoulder is and then switch to DPNs to make the tube of the sleeve? help!