Sylvie and Fred

Sylvie P is worked seamlessly from the top down.  

Both the back and the front are worked in Stockinette stitch in a sportive stripe pattern, with an additional “faux” seam that runs down at the center of the back. Knitting starts with the cast-on of the shoulders for the back. 
Once the short row shaped shoulder slope is done, the back is worked flat to underarm. Shoulder stitches are picked up to work the fronts to the same length. 
At underarm both fronts and back are joined to work the body in one piece top down back and forth to the bottom hem. 
Then the button bands and shawl collar are worked.

You can make this a fun Cardover/Pulligan (= a pullover that looks like a cardigan ;)) by sewing the buttons through both layers of the button bands or work buttonholes to make it a “real” cardigan.

Last the sleeve stitches are picked up around the arm openings to work the sleeves in Stockinette stitch top down in rounds to the cuffs. 

modifications/adjustments 
The body and the sleeves can be lengthened or shortened by working more or less rows/rounds before starting the ribbing. Size can be adjusted by working widthwise from the size you need/want for your bust/chest, and lengthwise from the size you need/want for your upper arms. Upper arm circumference is determined by the armhole length plus underarm stitches - work more or less rows for both fronts and back (follow instructions for a smaller/bigger size) to adjust armhole length.

Pockets could be added to your liking. The pattern doesn’t include instructions for pockets, but provides a link to a great tutorial.

Be aware that the amount of yarn needed will change with each alteration.