Jess shares his method of drafting a basic man’s pant block which goes to show you that a method doesn’t need to be complicated in order to be informative and useful. His first post on the page relates to a useful tool to add seam allowances quickly and painlessly:
What I really hate doing is drawing seam allowances so I decided to try to find a way that would make it easier when I’m drawing seam allowances on curves. I found this weird looking compass thingy (it’s called a Circle Master Compass and you can get one here.)It holds two pencils and it’s perfect. Just gauge the points of the pencils with a ruler to the seam allowance you need and trace around your block pieces. Make sure you hold it square from the edge while your drawing or it will shorten the seam allowance and check your work with a ruler. It works great.
I realize there’s a lot of legitimacy to men’s arguments that there are few pattern drafting books regarding men’s wear. In that vein I’d recommend Metric Pattern Cutting for Menswear by Winifred Aldrich or Fundamentals of Men’s Fashion Design by Masaaka Kawashima. Another favorite is Tailoring Suits the Professional Way by Clarence Poulin (out of print).