KARCEM is a greige knitter that coordinates dyeing, printing and finishing through a vetted contract network: yarn comes in, finished fabric goes out under a single point of contact. Because we knit the greige in-house and steer dyeing, printing and finishing across a close, vetted contract network — verifying the incoming colour to a ΔE<1 target on the lot — we see a fabric's hand, dimensional stability and colour behaviour not from isolated experiences but from the whole production chain. This knowledge hub exists to share that perspective. The aim is not to pad out content; it is to clarify a GSM decision, a composition choice or the difference between two knit structures for you — and then turn it into a sample.
The guides below are a concrete, jargon-free starting point for fashion designers, buyers and production/QC teams. Start with the pillar guide, or jump straight to the topic you have already decided on.
Knit & Structure
15 guidesKnit Fabric Selection Guide
A comprehensive starter guide comparing every knit structure, from single jersey to three-thread fleece, in one flow by end use, GSM and composition.
Product-Based Knit Fabric Selection Guides
How do you choose the right knit fabric, weight and fibre recipe for T-shirts, sweatshirts, polos, activewear and underwear? A practical decision guide…
Single Jersey or Interlock?
We address the difference in surface, body and end use between single-bed single jersey and double-bed interlock, along with which to choose for which product.
2×2 Rib vs. 1×1 Rib
2×2 rib versus 1×1 rib: the distinctions in wale width, stretch recovery and use in cuffs, collars and bodies.
GSM (Weight) Guide
What g/m² actually measures, the typical ranges from a T-shirt to a hoodie, and how GSM tolerance affects your order decision.
Elastane (Spandex) in Knits
How the elastane ratio changes stretch, shape retention and dyeing behaviour; we read the 3%–8% dosage range by product type.
Knit Fabric Engineering: Loop, Needle and Structure
Weft knit structure engineering: machine gauge and yarn matching, knit/tuck/miss, the four basic structures, Munden geometry equations,…
T-Shirt Fabric Selection: Single Jersey, Weight and Fibre Recipe
Fabric selection for t-shirts: single jersey, lycra single jersey and interlock comparison, typical weight ranges, combed/carded and cotton-modal-viscose fibre effects guide.
Sweatshirt and Hoodie Fabric: 2-3 Thread GSM Recipe
The difference between 2-thread and 3-thread fabric for sweatshirts and hoodies, brushed inner face, typical GSM weights and a product-based fabric selection recipe.
Polo Shirt Fabric: Piqué Selection and Collar Recipe
Polo shirt fabric guide: piqué structures (single, double, lacoste), typical weight ranges and the rib/interlock-rib collar-and-cuff recipe.
Activewear and Legging Fabric: 4-Way Stretch and Wicking
Fabric selection for leggings, legging-tees and sportswear: high elastane dosage, 4-way stretch, wicking finish, heat-set dimensional stability and squat-proof opacity guide.
Underwear and Babywear Fabric: Skin-Friendly Certified Choices
Underwear and babywear fabric selection: soft combed single jersey/interlock/rib, modal-cotton, low GSM, skin-friendly finishing and OEKO-TEX/GOTS certification guide.
Pique vs Lacoste vs Jersey: Choosing Fabric for Polo Collars
Differences in surface, texture and stability between pique, lacoste and jersey knits. Which fabric, which weight and which collar behaviour is right for a polo collar?
Two-Thread vs Three-Thread: French Terry vs Fleece
The structure, weight, inner-face and warmth differences between two-thread (french terry) and three-thread (brushed fleece): a practical guide to choosing hoodie and sweat fabric.
Ponte di Roma and Jacquard Knitting: Double-Plate Structures
What are ponte di Roma and jacquard knitting, and how do they differ? Compare the form retention, handle and dress/jacket uses of double-plate structures with technical tables.
Yarn & Fibre
5 guidesFibre and Yarn Science: A Fabric's Performance Begins in the Yarn
How do natural, regenerated and synthetic fibres, spinning methods, yarn count and sustainable yarns determine knitted fabric selection? A technical guide.
Combed, Carded and Open-End: A Yarn Quality Guide
How do combed, carded and open-end yarns differ? Compare the effects of combing, ring and rotor spinning on strength, pilling, surface and cost.
Cotton vs Modal vs Viscose vs Tencel: Fibre Selection Matrix
A B2B fibre selection guide comparing cotton, modal, viscose and Tencel on drape, moisture management, strength, sustainability and dyeing behaviour.
Yarn Count: How to Read Ne, Nm, Tex and Denier
Ne, Nm, Tex, Dtex and denier yarn numbering systems; indirect/direct logic, conversion formulas, the count-to-weight relationship and a Ne 30/1 reading example.
Recycled and Sustainable Yarns: rPET, Cotton, Organic
Compare rPET, recycled cotton and organic cotton yarns: GRS/RCS/OCS certification scope, performance differences and the rules for certified claims.
Dyeing & Colour
8 guidesDyeing, Printing and Finishing Process Guide
A comprehensive pillar guide to reactive/disperse dyeing, digital and rotary printing, colour fastness and finishing processes for quality and purchasing…
Delta E and Color Management: How Color Consistency Is Measured
CIELAB color space, the Delta E formula family (CIE76, CMC(2:1), CIEDE2000), visual threshold interpretation, metamerism, and lab-dip→bulk…
Reactive vs Disperse Dyeing: Key Differences
Reactive dyeing bonds covalently to cellulosic fibres; disperse dyeing colours polyester at high temperature. Fibre–dye match, fastness, process and cost differences.
Colour Fastness and ΔE<1: A Colour Consistency Guide
Wash, rubbing, light and perspiration fastness; ΔE (Delta E) measurement and the spectrophotometer; what a ΔE<1 tolerance means within a batch, between batches and on reorders.
Lab-Dip Approval Flow: Colour from Sample to Bulk Production
What is a lab-dip, evaluation with ΔE<1, light source and metamerism, colour continuity from approval to bulk production, CMC and DE2000 formulae. A step-by-step approval flow.
Digital Printing vs Rotary Printing: Cost and MOQ
Comparison of digital (DTG/transfer) and rotary printing: setup cost, MOQ, break-even logic, number of colours and detail. Which method is right and when?
Pigment and Garment Dyeing: Washed Vintage Look
Pigment dyeing and garment dye methods: washed/vintage handle, low water consumption, batch-colour flexibility, differences from reactive dyeing and fastness notes.
Low-Water and Sustainable Dyeing Technology
A guide to sustainable dyeing approaches through low liquor ratio dyeing, water and energy savings, wastewater management (ZDHC/ZLD) and process optimisation.
Finishing
8 guidesPerformance and Functional Finishes
Functional finishing guide for knitted fabric: moisture management, antibacterial, UV protection, water repellency, brushed and easy-care finishes;…
Spirality and Edge Curling: Causes and Control Through Finishing
What causes spirality and edge curling in knit fabric, how they are measured and how finishing controls them: a driver table, ISO 16322 / AATCC 179 tests and practical solutions.
Moisture Management and Wicking: Breathable Activewear
How do wicking, capillary moisture transport and hydrophilic finishing work? A guide to moisture management, drying speed and fabric selection for activewear…
Antibacterial, UV Protection and Water-Repellent Finishes
Antimicrobial odour control, UPF-based UV protection and water-repellent hydrophobic finishes: function, wash durability and ZDHC/OEKO-TEX certified chemistry selection.
Brushed (Sardon), Easy-Care and Anti-Pill Finishes
Brushing, easy-care and anti-pill finishing treatments: which finish suits which knitted fabric, their effects and applications.
Dimensional Stability and Spirality: Shrinkage Control
Causes of spirality (skew) in single jersey knit fabric, dimensional stability, and how sanforising and compacting control shrinkage.
Finishing: How Sanforizing, Compacting and Stenter Work
How sanforizing (pre-shrinking), compacting, stenter and heat-set finishing steps determine shrinkage control, dimensional stability and handle in knitted fabric — the KARCEM…
Pretreatment: Desizing, Singeing, Bleaching, Mercerization
Pretreatment steps before dyeing: desizing, singeing, bleaching and mercerization. The purpose, output and impact on dye quality (ΔE<1) of each step, together.
Quality & Testing
6 guidesQuality Control and Test Standards
Colour fastness, shrinkage, pilling, four-point inspection and the lab-dip approval process for knitted fabric. ISO 105 and AATCC test standards, ΔE<1…
Textile Test Standards Reference
A comparative ISO ↔ AATCC ↔ ASTM/BS reference for textile testing: standard numbers for wash, rubbing, light, perspiration, shrinkage,…
Colour Fastness Test Protocols: ISO 105 and AATCC
Wash, rub, light and perspiration fastness tests: ISO 105 series (C06, X12, B02) versus AATCC (61, 8, 16), 1-5 grey scale ratings and acceptance thresholds.
Shrinkage Testing and Dimensional Stability: Wash Loss
Wash shrinkage measurement, dimensional stability, sanforising/compacting effect, knit spirality and typical acceptance tolerances.
Pilling and Martindale Abrasion Resistance
Pilling formation, the Martindale and ICI box methods, cycle counts, abrasion resistance, fibre/yarn effects and pilling control in knitted fabric using the 1-5 grading scale.
The 4-Point Fabric Inspection System and GSM/Width Tolerances
How does the 4-point fabric inspection system work? Points 1-4 by defect size, the per-100-yards acceptance logic, GSM +-5% and width tolerances, the inspection flow and…
Sustainability & Regulation
12 guidesSustainable Textile and Regulatory Compliance Guide
GOTS/GRS certified transparency, ZDHC chemical management, EU ESPR/Ecodesign readiness and water-energy-carbon metrics: a sustainability compliance guide…
EU Textile Regulation Tracker 2026
The 2026 status of EU textile legislation: ESPR and the Digital Product Passport, mandatory textile EPR, the REACH formaldehyde…
How to Verify a Textile Certificate: Scope and Transaction Certificate
How to verify a textile certificate: Scope vs Transaction Certificate, validity checks, chain-of-custody models and the red flags that expose a fake — a practical guide for GOTS/GRS/RCS.
MRSL vs RSL: What Dyeing & Finishing Actually Controls
An MRSL restricts production chemistry (input formulations), while an RSL restricts residues in the finished product. We explain a dye…
What KARCEM Provides for DPP: Digital Product Passport Supplier Data
What KARCEM provides for the Digital Product Passport (DPP): tier-1/tier-2 supplier data, a field/description/source table and a downloadable data sheet for DPP-ready partnership.
EU Ecodesign (ESPR) and Preparing for Fabric Supply
How are ESPR, the Digital Product Passport and traceability reshaping textile supply? The data brands will request from suppliers and how to prepare.
GOTS & RCS Certified Production: Cutting Carbon Footprint
GOTS verifies organic content; RCS and OCS verify recycled content. Certification scope, chain of custody and what they mean for carbon-footprint reporting.
ZDHC Compliance: The New Chemical Standard in Textiles
What are ZDHC and MRSL, and why does managing input chemicals matter more than controlling output? We explain what it means for brands and auditors, using KARCEM as an example.
DPP-Ready Supplier: The Data They Must Provide You
The data fields you should request from your supplier for the EU Digital Product Passport (DPP): fibre composition, origin, ZDHC/MRSL compliance, certificate numbers…
REACH/SVHC and OEKO-TEX STANDARD 100: EU Chemical Compliance
How do the REACH regulation, the SVHC candidate list and OEKO-TEX STANDARD 100 connect? The ZDHC/MRSL relationship, evidence documents for the buyer and a supplier checklist.
CBAM, EPR and CSDDD: EU Supply Chain Obligations
How do CBAM border carbon, EPR textile waste responsibility and CSDDD due diligence obligations affect the supplier? The phased 2027+ timeline and how to prepare.
Scope 3 and Carbon Footprint: Providing Production Data
The Scope 1/2/3 split in textiles, production-stage energy, water and chemical data, LCA/PEF logic and the supplier's contribution to brand carbon reporting.
Sourcing & Reference
8 guidesProcurement, Sourcing and Collaboration: A Framework for Choosing the Right Knitted Fabric Supplier
The complete framework for sourcing knitted fabric from an in-house greige knitter that coordinates dyeing, printing and finishing through a vetted contract network: supplier selection criteria, traceable chain, sample to…
Textile Terms Glossary
Clear definitions of terms such as single jersey, greige, finishing, fastness, ΔE, mercerisation and commission/CMT — a reference for every concept used across the guides.
Supplier Qualification: Audit and Certification Cross-Map
A comparison of the scope and type of SLCP CAF, Higg FEM/FSLM, SMETA, amfori BSCI, OEKO-TEX and ZDHC audit programs. The "assess once,…
MOQ, Sampling and Delivery Process
MOQ logic for knitted fabric, sample types (lab-dip, strike-off, bulk), the approval flow and the order→yarn→knitting→dyeing→finishing→QC→despatch delivery stages.
Contract Dyeing, Printing and Finishing: The KARCEM Coordination Model
What is contract dyeing-printing-finishing, and when is it chosen? KARCEM does the knitting and coordinates dyeing-printing-finishing across a contract network it vets;
Incoterms and Shipment: FOB, CIF and Container Planning
EXW, FOB, CFR, CIF, DAP responsibility split in knitted fabric export; container roll/carton planning, shipping documents and lead-time impact. A B2B sourcing guide.
ESPR/DPP-Ready Supplier Selection: A Guide to Data Fields
The data fields you must request from your supplier for the EU's ESPR and Digital Product Passport (DPP), the traceability obligation, and the advantage of an in-house knitter…
Preventing Late Deliveries and Waste: A Coordinated Contract Network
Why does a fragmented contract chain produce late deliveries and waste? How we prevent it with in-house knitting plus a vetted, coordinated contract network — a comparative…
Once you have decided which fabric suits the collection in hand, you can view every knittable structure in the portfolio on the Fabrics page, filtered by type, composition and GSM.