I live where it is cold and I would like my granddaughter to wear the Music Class blouses now with the Music Box jumpers. I looked at the view B long sleeve pattern piece and the top of the sleeve is shaped differently. The style of the blouse in view B is different than view A and has a cuff. Can I refer to a sleeve pattern piece from another Oliver & S pattern or just extend the short sleeve and taper it down to the cuff? I'm not how much to taper as I go down the sleeve.