Yeah, you can do that, sketch out the shape you want and put in the measurements of the different sections. But it looks sorta like you could just do 2 squares for the body, sew the shoulders together to the width you want for the neck then pick up for the sleeves. Or make 2 T shape pieces, inc on the sides where you want the sleeves to begin and after some inc rows, CO more sts for the lower sleeves. Look up patterns for 'bat wing' or 'dolman' sleeves and just make the top edges of the body straight across and seam the shoulders.
sue- knitting heretic