cast off for sleeve cap at beg of every row each side: 2-3-3 (4-4) sts until piece measures 21-22-24 (29-33) cm, now cast off 3 sts each side and cast off remaining sts with k over k and p over p.

How would the previous sentence be correctly capitalized?
Cast off for sleeve cap at beg of every row each side: 2-3-3 (4-4) sts until piece measures 21-22-24 (29-33) cm, now cast off 3 sts each side and cast off remaining sts with K over K and P over P.