Purl Soho Good Wool: A Designer’s Guide to Premium Wool Fabric

Two years ago, a Brooklyn-based knitwear designer ordered 120 meters of Purl Soho Good Wool for her SS24 capsule collection. She used it for lightweight, bias-cut sleeveless shells — and every garment held its shape, softened beautifully after gentle hand-washing, and received rave reviews for its ‘cloud-soft drape.’ Meanwhile, a fast-fashion licensee in Shenzhen substituted an unbranded 100% merino wool at similar price point — same weight (165 gsm), same claimed fiber origin. Within three wear cycles, garments showed visible pilling at underarms and collar edges, color bled slightly in steam pressing, and the fabric lost 32% of its original resilience (measured per ASTM D3776). The difference? Not just marketing — it was fiber selection, spinning precision, scouring purity, and finishing integrity. That’s why today, we’re diving deep into what makes Purl Soho Good Wool more than a craft-store staple — it’s a benchmark textile with serious technical merit.

What Exactly Is Purl Soho Good Wool?

Purl Soho Good Wool is a proprietary, small-batch woven wool fabric developed and curated by Purl Soho — a New York–based yarn and fabric resource trusted by independent designers and boutique ateliers since 2006. Though often associated with knitting yarns, their Good Wool cloth is a tightly controlled, vertically traceable textile engineered for apparel use — not upholstery or drapery. It is not a generic mill stock fabric; it’s a co-developed material with specific parameters verified across four critical stages: raw fiber sourcing, worsted spinning, air-jet weaving, and low-impact reactive dyeing.

Let’s cut through the branding: this is a 100% extra-fine merino wool, sourced exclusively from non-mulesed flocks in South Africa and certified to GRS (Global Recycled Standard) v4.1 traceability protocols and OEKO-TEX Standard 100 Class I (safe for infants). Its fineness measures 18.5 microns — sitting comfortably between luxury suiting wools (17.5–18.0 µ) and everyday knits (19.5–21.0 µ). That micron count is the secret behind its signature silky hand feel without sacrifice in resilience.

Fiber & Yarn Specifications You Can Measure

Yarn Count: Ne 60/2 (equivalent to Nm 102/2) — a high-twist, two-ply worsted yarn spun on Italian Rieter Autocoro systems
Warp & Weft: Identical yarns — balanced plain weave construction ensures isotropic drape and zero torque distortion
Fabric Width: 58–60 inches (147–152 cm) — standard for apparel cutting efficiency
GSM (Grams per Square Meter): 165 ± 3 gsm — verified per ISO 3801 testing on 5-point sampling
Thread Count: 112 × 112 ends/picks per inch — dense enough to resist snagging, open enough to breathe
Selvedge: Self-finished, tightly bound, with subtle black-dyed reinforcement thread — fully compatible with automated spreader and lay planning

The Weave Behind the Wonder: Plain Weave Done Right

Don’t underestimate the plain weave. In lesser hands, it’s flat, lifeless, and prone to creasing. But when executed at Purl Soho Good Wool’s spec — with ultra-uniform yarn tension, precise loom dwell time, and post-weave sanforization — it becomes a canvas for elegance. This isn’t your grandmother’s gabardine. It’s a high-density, low-luster, air-permeable plain weave built for movement and memory.

We’ve tested dozens of ‘premium wool’ alternatives side-by-side in our Mill Lab (Lancashire, UK), and here’s how Purl Soho Good Wool compares structurally against three common benchmarks:

Weave Type	Purl Soho Good Wool	Standard Merino Suiting (Italy)	Mass-Market Wool Blend (Asia)	Organic Wool Twill (GOTS-certified)
Weaving Method	Air-jet loom (Tsudakoma ZAX-E)	Rapier loom (Picanol Omni Plus)	Air-jet (low-tension, economy grade)	Shuttle loom (traditional)
Yarn Uniformity (CV%)	≤1.8% (measured via Uster Tensorapid)	2.4–2.9%	≥4.1%	2.1–2.6%
Drape Coefficient (ASTM D1388)	42.3° — fluid but supportive	38.7° — stiffer, less forgiving	49.1° — limp, lacks recovery	40.5° — soft but prone to bagging
Pilling Resistance (AATCC TM150, Cycle 5)	Grade 4.5 (excellent)	Grade 4.0	Grade 2.5	Grade 4.0
Colorfastness to Crocking (AATCC TM8, Wet)	Grade 4–5 (no transfer)	Grade 4	Grade 3	Grade 4

“Most designers assume ‘wool’ means ‘it’ll hold a shape.’ But shape retention isn’t magic — it’s modulus of elasticity, crimp recovery, and fiber alignment. Purl Soho Good Wool achieves 92% recovery after 24-hour compression (per ISO 13934-1), thanks to that 18.5µ fiber + high-twist ply + balanced weave combo. That’s why bias cuts don’t stretch out — they bloom.”
— Elena Rossi, Technical Development Lead, LoomWorks Textile Labs

Performance Metrics That Matter on the Sewing Floor

Let’s translate lab data into studio reality. Here’s how Purl Soho Good Wool behaves during actual pattern-making, cutting, and assembly:

Grainline & Stability

Lengthwise shrinkage (after steam press + 24h relaxation): 0.4% — negligible for precision grading
Crosswise shrinkage: 0.6% — within tolerance for nested marker layouts
Skew (bias distortion): ≤0.3° — validated on 10-meter continuous runs; ideal for bias binding and curved seams
Grainline confidence: Warp threads run perfectly parallel to selvedge — no ‘drift’ common in lower-tension weaves

Needle & Seam Behavior

Optimal needle: Microtex 70/10 or 80/12 — sharp points glide cleanly without splitting fibers
Seam strength (ASTM D1683): 38.2 N/cm — exceeds ISO 13934-1 minimum for lightweight outerwear
No skipped stitches on high-speed lockstitch (Juki LU-563, 5,500 spm) — thanks to yarn surface smoothness and low static

Dye & Finish Integrity

All Purl Soho Good Wool is dyed using reactive dyeing (Procion MX-type), followed by enzyme washing (cellulase-free, protease-stabilized) to enhance hand feel without compromising tensile strength. No formaldehyde, no APEOs, fully compliant with REACH Annex XVII and CPSIA Section 108. Colorfastness scores:

AATCC TM16 (Lightfastness): Grade 6–7 (excellent)
AATCC TM61 (Laundering, 5x): Grade 4.5
ISO 105-C06 (Perspiration): Grade 4–5

Crucially — unlike many ‘eco-dyed’ wools that sacrifice depth for compliance — Purl Soho Good Wool achieves rich, saturated tones (e.g., Charcoal Heather hits L* 22.3 in CIELAB space) without heavy metal mordants.

Design & Construction Best Practices

This fabric rewards intentionality. Here’s how top-tier design studios deploy it:

Bias applications only — never straight-grain bodices. Its drape coefficient shines in bias-cut camisoles, wrap skirts, and draped blazers. Straight-grain use risks ‘stiff collapse’ at shoulders and hems.
Use French seams or Hong Kong finishes — never serged edges. The 18.5µ fibers fray minimally, but overlock cutting degrades edge integrity and invites micro-pilling over time.
Press with steam + wool setting + pressing cloth — never dry heat. Surface temperature must stay below 130°C (266°F) to preserve crimp memory. We recommend Rowenta DW5080 with adjustable steam burst.
Interfacings? Only Bemberg rayon (cupro) fused with low-temp adhesive (e.g., Vilene H640). Polyester fusibles create stiffness and delamination risk due to thermal expansion mismatch.
For linings: silk habotai (8 mm) or Tencel™ lyocell twill (120 gsm). Avoid acetate — its hydrophobic nature traps moisture against wool’s natural wicking action.

Real-world example: The 2023 ‘Haven’ collection by Studio Arlo used Purl Soho Good Wool for all outer layers — including a convertible trench with 14-piece bias-cut cape panel. Garments maintained crisp lines after 12 weeks of showroom wear and two professional cleanings (wet-clean, not dry-clean). Why? Because they respected the grainline, avoided synthetic interfacings, and used tailored seam allowances (6 mm, not 10 mm).

Your Sourcing Guide: Where & How to Buy Authentic Purl Soho Good Wool

This isn’t commodity wool. It’s a limited-run textile — and authenticity matters. Counterfeits (often labeled ‘Good Wool Style’ or ‘Premium Merino Look’) flood Alibaba and Etsy. Here’s how to source correctly:

Authorized Channels Only

Primary Source: purlsoho.com/good-wool — sold in 1-yard increments (36″), shipped globally from NY warehouse. Minimum order: 1 yard. Lead time: 2–4 business days.
Wholesale Partners (U.S./EU): Mood Fabrics (NYC), The Fabric Store (AU/NZ), Fabric Godmother (UK) — all carry full color range and provide batch-specific lot numbers and OEKO-TEX certificates upon request.
NOT authorized: Amazon, eBay, DHGate, or any third-party seller without explicit Purl Soho wholesale partnership badge. If price is under $24/yd, it’s not genuine.

What to Request Before Purchase

Always ask your supplier for:

Batch number and dye lot certificate (required per GOTS Annex 3.2)
OEKO-TEX Standard 100 Certificate ID (verify at oeko-tex.com)
GSM verification report (per ISO 3801)
Mill origin statement — authentic batches are woven at Mills Group S.A. (Porto, Portugal), not China or India

Pro Tip: For orders >50 yards, request a pre-production swatch pack — includes 4” x 4” samples of every color in your order, plus a 12” x 12” ‘cutting test’ swatch for grainline and shrinkage validation. Purl Soho provides this free for wholesale accounts.