This Vest/Top is made out of 4 rectangles of fabric surrounded by a crochet ending. You can easily modify the pattern to adapt the shape while you are adding the crochet part. To transition from fabric to crochet I have used a yarn needle and sew a blanket stitch all around.

It is up to you if you want to use leftover fabric or just buy a new one. In this case, the total needed will depend on the width of the fabric and how you want the print design to show. (i.e for size S and a 120 cm (48”) width fabric, you may only need 25 cm (10”)

I recommend to customize the size of the mid-front crochet rectangles and the seams once you have finished the shoulders. The pictures may give you an idea, but it will very much depend on your size and preferences.