Pattern Making — Dennis Chunman Lo (PDF): How to Find, Use, and Improve the Resource

• Table of contents and scope: a good pattern-making PDF clearly lists chapters on measurement, blocks/slopers, grading, fitting, darts, ease, collars, sleeves, and alterations.
• Illustrations and diagrams: pattern making is visual—clear, labeled diagrams and step-by-step photos are essential.
• Precision of instructions: look for numerical examples, formulas for ease and grading, and clear notations for seam allowances and grainlines.
• References and author credentials: check the author’s background and any cited sources or accompanying resources (e.g., downloadable patterns or worksheets).

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If you'd like more help starting your pattern-making journey, :

Pattern making requires precision. Trying to draft a pattern on a table while squinting at a phone or tablet is inefficient.

• Choose a garment you want to create a pattern for (e.g., a dress, top, or pant)
• Apply the Denman-Chunman method to modify the basic block pattern to create a pattern for your chosen garment