Denim fabric is highly sensitive for defects, mainly like starting marks (crack and thick place), broken pick, snarl and missing end etc.
Denim Fabric: Types and Manufacturing Process - Textile Learner
A Comprehensive Review of Common Defects Found in Woven and Knitted Fabrics, PDF, Weaving
Knitting Faults in fabric
23 Fabric Defects to Look Out for During Fabric Inspection
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Weaving Faults in Fabric: Causes and Remedies - Textile Learner
23 Fabric Defects To Look Out For During Fabric Inspection, PDF, Weaving
Defects In Woven Fabric. After the knit defects post, we will…, by Stitchdiary
Classify The Fault: Defects In Knit Fabric, by Stitchdiary