Primary sources first
When a sizing, footwear or care claim can change, we prefer the responsible standards body or regulator rather than copying a conversion blog. Each maintained source records a verification date.
ISO 8559-2:2025 — Size designation of clothesCurrent published ISO clothing size designation standard; based on body dimensions. Verified 2026-08-09.ISO 19407:2023 — Footwear sizing conversionPublished conversion guidance based on foot length across major shoe sizing systems. Verified 2026-08-09.ISO 3758:2023 — Textile care labellingCurrent published care-labelling code covering washing, bleaching, drying, ironing and professional care. Verified 2026-08-09.FTC — Complying with the Care Labeling RuleUS guidance explaining care-label obligations and reasonable-basis requirements. Verified 2026-08-09.GINETEX — Care labellingExplains that the five familiar care symbols are protected trademarks in most countries and require licensing for reproduction. Verified 2026-08-09.ISO/DIS 8559-6 — Breast body measurementsUnder-development draft concerning anthropometric definitions for breast measurements; not treated as a final sizing standard. Verified 2026-08-09.