Sleeve into Armhole Question
I'm confused on something. When making a sweater, you knit the front and back to x number of inches, then BO some stitches to shape armholes. I understand that. Then you knit the sleeves separately by casting on x number of stitches according to the pattern then working for however long.
My question is this: How do you know that there will be enough sleeve to fit into the armhole or that the sleeve won't be too big around to fit into the armhole? Does it just magically work out? Do you adjust for this somehow? The patterns are no help.