This jumper has an unusual construction; knitted in two stitch patterns and in two directions, with seams not at the side but off centre at both front and back. The body is constructed in two pieces, each piece comprises one half that will be part of the front and one half that will be part of the back; you split the work at the armhole opening and work the rest separately. The St st piece is knitted vertically, so the wide stripes run horizontally on the garment, but the G st piece is knitted
sideways so the narrow stripes run vertically down the garment,
so keep this in mind to avoid any confusion. One sleeve is worked vertically in St st and the other sleeve is worked in G st sideways so the thin stripes run vertically down the sleeve. You will have a lot of fun knitting this pattern.