China Top Functional T Shirt and Inner Wear Manufacturer?

Evaluation Dimension	Recommended Requirement or Benchmark	Typical Verification Method	Relevant Standard or Reference
Raw Material Inspection	Check fiber composition, fabric weight, color, width, defects, and lot traceability before cutting.	Incoming inspection report, fabric-width measurement, GSM test, and shade-band approval.	ISO textile testing practices; buyer-approved specifications.
Fiber Composition	The actual fiber blend should match the order specification and product label within the applicable legal tolerance.	Laboratory fiber-identification and quantitative-composition testing.	ISO 1833 series; applicable textile labeling regulations.
Fabric Weight and Construction	Maintain the approved GSM, knit structure, stretch direction, and recovery performance for the intended use.	GSM cutting test, loop or stitch inspection, and dimensional measurement after conditioning.	ISO 3801 for mass per unit area; buyer technical specification.
Colorfastness	Color should remain within the approved shade standard and resist washing, rubbing, perspiration, and light exposure according to the product end use.	Grey-scale rating, crocking test, laundering test, perspiration test, and light-exposure test.	ISO 105 series; AATCC colorfastness methods where specified by the buyer.
Dimensional Stability	Post-wash length and width changes should meet the agreed tolerance, commonly controlled around ±3% to ±5% depending on fabric and construction.	Measure garments before and after the specified washing and drying procedure.	ISO 5077 and ISO 6330; care-label instructions.
Seam Strength and Stitch Quality	Seams should be secure, even, free from skipped stitches, open seams, loose threads, and needle damage.	Visual inspection, seam-opening inspection, stitch-per-inch check, and tensile testing when required.	ISO 13935 series; approved workmanship standard.
Stretch and Recovery	Functional shirts and inner wear should provide consistent elongation and recovery without permanent bagging at the neck, waistband, or key body areas.	Stretch-percentage measurement, repeated-extension testing, and recovery assessment.	ASTM D2594 or buyer-defined stretch and recovery protocol.
Moisture Management	Moisture-wicking claims should be supported by measurable spreading, absorption, or drying performance rather than marketing language alone.	Vertical wicking, spreading, absorption, and drying-rate laboratory tests.	AATCC TM195 or equivalent validated laboratory method.
pH and Restricted Substances	Finished garments should meet the destination market’s chemical requirements, including limits for restricted dyes, formaldehyde, heavy metals, and other controlled substances.	Third-party chemical screening and batch-level or risk-based laboratory testing.	OEKO-TEX® STANDARD 100 criteria; REACH requirements for applicable markets.
Cutting and Sewing Control	Use approved patterns, marker plans, seam allowances, SPI settings, and in-line quality checkpoints to control size consistency.	First-piece approval, in-line inspection, measurement chart comparison, and hourly workmanship checks.	AQL-based inspection plan; buyer-approved technical package.
Final Garment Inspection	Inspect appearance, measurements, labels, accessories, packaging, stains, holes, shade variation, and functional details before shipment.	Final random inspection using an agreed sampling plan and defect classification.	ISO 2859-1 sampling principles; commonly agreed AQL levels such as 2.5 for major defects.
Social Compliance	Production should address working hours, wages, workplace safety, forced labor, child labor, and grievance mechanisms.	Factory social audit, document review, worker interviews, and site inspection.	ILO fundamental principles; SMETA, amfori BSCI, or equivalent buyer-required audit.
Environmental Management	Control energy, water, wastewater, chemicals, waste segregation, and environmental permits throughout textile and garment production.	Environmental management-system audit, wastewater records, chemical inventory, and waste documentation.	ISO 14001; applicable local environmental regulations; ZDHC guidance where relevant.
Management-System Certification	A documented quality system should define responsibilities, corrective actions, traceability, calibration, and continual improvement.	Review of valid certificates, scope, issuing body, internal audit records, and corrective-action reports.	ISO 9001 for quality management; certificate validity must be independently verified.
Order Traceability	Each production lot should be traceable from yarn or fabric receipt through cutting, sewing, finishing, inspection, and shipment.	Lot codes, production records, inspection reports, packing lists, and retained samples.	Documented quality-control procedure and buyer compliance requirements.