If you like to develop your own sweater patterns, I know you would appreciate THE SWEATER WIZARD. It's worth every dollar. It will give you the 'blueprints' and 'specs' for any style of sweater, but YOU DECIDE on the yarn, the pattern stitch, the trims, the ribbings, the embellishments, the size, the fit, etc. It will give you specs for the correct size! It prevents you from a lot of frogging, or, worse, ill-fitting sweaters. No matter how beautiful the yarn and pattern stitch, if the sweater doesn't fit, it's a bust.
I "designed" these recently, using the Sweater Wizard as my "architect"! I am still the 'contractor-builder' and designer! The Wizard just draws up the 'blueprints' for me, including schematics! He tells me how many yards I will need, too!