In this DROPS video we show how to knit a raglan. Slip first sleeves on the same needle as body piece where bind off for armholes. Insert a marker in all transitions between body piece and sleeves. Now dec for raglan.
In our video we are dec each side of 2 sts at each transition on every other row, i.e. every row from RS, this gives 4 sts in stockinette at each transition.
Start 3 sts before marker; K2 tog, K1, marker, K1, slip1 st as if to K, K1, psso.
(For 2 stockinette sts in each transition: Start 2 sts before marker; K2 tog, marker, slip1 st as if to K, K1, psso)