You'll need to decide on four measurements here (the measurements I used when cutting are in brackets):
- width of sweater body (40cm)
- length of sweater (88cm)
- width of cowl neck (26cm)
- length of cowl neck (50cm)
I cut both the front and the back sweater body pieces at the same time by placing two pieces of folded fabric so that the fold was on the left side. Note that the cowl neck and the sweater body are a connected piece of fabric. The total length of mine was 138cm (cowl). When you are cutting a side with the fold be sure to half the dimension.
I used a sweater that I have that fits me to get the width of the sweater body. I took a measuring tape and using a mirror decided what measurement I wanted for the length of the sweater, from my shoulder to above my knees (I wanted the sweater long enough to be pants-optional).
For the width of the cowl neck, I measured on my shoulders how wide I wanted the neckline to open up. For the length of the cowl neck, I wanted the zipper of the sweater hang in the middle of my face, so I measured from the nape of my neck over the back of my head to my nose.
Note that you will be cutting a shoulder where the cowl meets the sweater body. My cowl width is 26cm and my sweater body width is 40cm, so my shoulder width is 7cm on each shoulder. I gave my shoulders a slight slope to match the sweater I had that fit me.