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I cast on my 118 stitches and it says to slip 1 stitch beginning each row then do a p2 k2 rib stitch,to last 2 p2 . so I’ll end up with 3 stitches b/c I slipped the first one- what do I do? PLUS it says add 3.25 inches to each side for length. where do I add that in ?(assuming that at some point I’ll have to cast on extra stitches?)

You could skip slipping the first stitch if you want. You could add an extra stitch at each end. You could just sl p1, k2 to start. I think I’d just work the first stitch.

Cute pattern. I think my GD would like it.

Very elegant pattern! Thanks for the link.
You could work the first stitch in each row as GG suggests or you can slip the first stitch in each row. It depends on the kind of edge you’d llike on this bolero. If you slip the first stitch, just consider it one stitch of the p2 in row 1 or one of the two knit stitches to start row two. Then the first row becomes

slip 1, p1, k2, (p2 k2) to last 2 stitches, p2

row 2: slip 1, k1, p2 (k2 p2) to last 2 stitches, k2

The calculations that you did at first (measuring the length between your shoulders and adding for the sleeves) determined the width but the 3.25 + 3.25" is to add ease to the length. Measure the circumference of your upper arm and add 6.5’ to that to get the length you should knit.