When you walk into three local stores looking for a size 8, you might leave with a size 6, an 8, and a 10—all of which fit. The same confusion shows up online, where shoppers can’t try garments before buying.
Why sizes differ
Ready‑to‑wear apparel was created to fit a range of bodies into repeatable size categories, but those categories were never meant to be universal. A 1994 report from the National Institute of Standards and Technology noted that U.S. sizing standards were based on body‑measurement data collected by the Department of Agriculture in the late 1930s. Since then, bodies, demographics, and fashion preferences have changed.
Today, ASTM International maintains multiple body‑measurement standards for different apparel populations and figure types, but manufacturers are still free to develop their own fit specifications, target customers, and pattern‑grading approaches. No single sizing chart governs every garment.
Vanity sizing and its limits
Vanity sizing—assigning a garment a smaller numerical size than its measurements might suggest—can make shoppers feel better about themselves, according to a Journal of Consumer Psychology study. A 2017 analysis of size charts from 54 American apparel retailers also found evidence of size variation and inflation in women’s apparel.
However, vanity sizing does not explain every discrepancy. Brands can define size categories differently without intending to mislead, and there is no universal threshold for what qualifies as vanity sizing.
Fit is more than a number
A size is a category, not a precise measurement. ASTM standards use body measurements as baselines while accounting for fabric, ease, styling, and fit. Body measurements describe the wearer; garment measurements describe the clothing, and the two need not be identical.
Pattern‑makers determine proportions such as shoulder width, bust or chest room, rise, inseam, waist placement, hip room, sleeve length, leg opening, and overall length. Two pairs of pants intended for similar body measurements can fit differently if one has a higher rise or more hip room. Ease—extra space that allows movement or creates a silhouette—varies by design. A fitted dress may have little ease, while an oversized sweater has more.
Fabric, construction, and intended use
Stretch versus non‑stretch material, knit versus woven construction, fabric weight, and recovery after stretching all affect fit. Seaming, lining, and structure also influence movement, and intended use matters: outerwear needs room for layers.
Even within the same brand, different designers, fabrics, or manufacturing facilities can produce varying fits. Brands may update specifications or fit standards as product lines and target customers evolve.
How shoppers can navigate the maze
Online shopping didn’t create inconsistent sizing; it removed the fitting room as an immediate solution. When shoppers encounter different brand charts, product‑specific information becomes crucial. Look for fabric composition, intended fit, and model measurements. Reviews that note whether a garment runs small, large, or true to size can provide valuable context.
Treat a brand’s size chart as a starting point, not a guarantee. Check whether it lists body or garment measurements and follow the brand’s measuring instructions. Compare the relevant garment category, fabric, and stretch; read fit descriptions; and consider model measurements and sizes when available. Above all, focus on the intended fit rather than automatically ordering your usual size.
“True to size” generally means a garment fits as someone expected based on previous purchases—not that it conforms to a universal size. Body proportions and personal preferences also differ, so reviews can help but two shoppers may reasonably reach different conclusions about the same item.
ASTM lists 15 active standards for body measurement and apparel sizing, covering populations from children to various adult figure types. While better body‑measurement data, digital fitting technology, and detailed sizing tools may improve shopping, they cannot eliminate the challenge of translating varied bodies and clothing into a limited set of labels.
In short, a clothing size is shorthand, not an objective measurement shared across the industry. Vanity sizing contributes to variation, but pattern‑making, ease, fabric, construction, and intended fit play equally important roles. Consumers are better served by focusing on measurements and product‑specific fit information rather than loyalty to a single number.
Original reporting: KRDO (Colorado Springs metro) — read the source article.
