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Decision fieldFree + paidThreadloop Sewing Pattern DatabaseGlobalRemoveOpen accessKnitting Needle to Crochet Hook Size ChartGlobalRemoveOpen accessApparel Measurement Tolerance Setting RecordGlobalRemove
Decision fit
Primary jobFind patterns & fitLearn techniquesSource production
Also useful forNo additional job recordedNo additional job recordedNo additional job recorded
AreaPatterns & fitYarnProduction
Best forSearching current and out-of-print sewing patternsFinding the current CYC hook and needle aliases that share one known nominal metric diameter before confirming project gaugeTurning an inherited or proposed garment tolerance into a controlled POM method, capability study, decision boundary, inspection rule, and change record
Know before usingCommunity members add and quality-control the records, so confirm sizing, measurements, fabric suggestions, format, availability, errata, license, and purchase terms with the designer or publisher. Adding an entry to a stash does not provide the pattern files. Saved searches and private PDF storage are paid Plus features, and a listing or review does not establish pattern accuracy or fit.A shared nominal diameter does not make a knitting needle and crochet hook interchangeable or predict equal gauge or fabric. The reference is not a physical measurement, manufacturer inspection, UK or Canadian conversion, steel-hook chart, tool recommendation, yarn assignment, or project approval.The record does not supply universal POM values, validate fit across a population, prove process capability, choose a statistical study or sampling plan, reproduce licensed standards, or replace qualified technical, fit, quality, statistical, safety, compliance, and legal review.
Practical access
ForMakersMakersApparel brands
Location or jurisdictionGlobalGlobalGlobal
AccessFree + paidOpen accessOpen access
FormatCommunityStitch AuthorityStitch Authority
Source typeCommunity databaseStitch AuthorityStitch Authority
Account, payment, and exit
Access scopeSewer searching pattern records or organizing patterns, projects, fabric, notions, and private files.Not yet reviewed at this level.Not yet reviewed at this level.
Before an accountBrowse the pattern database, guide, designers, publications, and public community areas without creating an account.Not yet reviewed at this level.Not yet reviewed at this level.
Free-account boundaryA free account needs no card and supports a stash, wishlist, projects, reviews, and personal organization.Not yet reviewed at this level.Not yet reviewed at this level.
Payment boundaryPlus adds PDF pattern storage, collections, saved searches, bulk editing, and other workflow features on monthly or annual billing.Not yet reviewed at this level.Not yet reviewed at this level.
Cancellation or exitCancel through an in-account link. Paid features remain through the current billing cycle, then the account returns to free features.Not yet reviewed at this level.Not yet reviewed at this level.
Saved work and dataThe terms say submitted materials remain yours, but the checked public pages do not explain a full export or how stored PDFs behave after downgrade. Keep originals outside the platform.Not yet reviewed at this level.Not yet reviewed at this level.
Source and review
What the source establishesThreadloop's official guide describes an independent, fully crowdsourced database covering available and out-of-print sewing patterns. Its search supports pattern type, fabric type, age group, body type, cup size, level, format, file features, language, measurements, availability, and other filters; members can also track a stash, wishlist, projects, reviews, and discussions. Current terms state that the free plan requires no card, paid upgrades start billing immediately, cancellation retains paid features through the current cycle, and the account then returns to free features.Rechecked July 28, 2026. The lookup reproduces the current public Craft Yarn Council metric and U.S. alias rows, aligns hooks and needles only when their nominal millimetre value matches, and leaves missing rows or aliases unfilled.The guide cites current ISO, AATCC, and NIST sources for body and garment measurement boundaries, textile conditioning, dimensional-change testing, repeatability and reproducibility, and AQL-indexed sampling, while requiring the live product owner to set rather than inherit numerical tolerances.
Linked page reviewedJul 28, 2026Jul 28, 2026Jul 15, 2026
Next review dueJan 24, 2027Jul 28, 2027Jul 15, 2027
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