A.T. Robertson Commentary Mark 2:21

"No man seweth a piece of undressed cloth on an old garment: else that which should fill it up taketh from it, the new from the old, and a worse rent is made." — Mark 2:21 (ASV)

Seweth on (επιραπτε). Here only in the N.T. or elsewhere, though the uncompounded verb ραπτω (to sew) is common enough,

sews upon: in Mt 9:16 and Lu 5:37 use επιβαλλε, put upon or clap upon.