Most sizing complaints a brand receives don’t come from a manufacturing defect. They come from a measurement that was never defined clearly enough before cutting started. Getting fit right isn’t about chasing an impossible standard — it’s about setting consistent, well-documented measurements your manufacturer can actually reproduce, order after order.
Garment Measurements vs. Body Measurements
These two get confused constantly, and the confusion causes real problems. A body measurement describes the wearer — chest circumference, waist, height. A garment measurement describes the finished product, and it always includes ease: the extra room built in for movement, comfort, and the intended silhouette.
Your tech pack should specify garment measurements, not body measurements, because garment measurements are what the factory is physically cutting fabric to. A brand that hands over body measurements and expects the factory to figure out the right amount of ease is handing over a decision that should have been made in-house.
The Core Measurements Every Brand Should Know
The exact list of points of measure (POMs) varies by garment category, but most tops and bottoms converge on a similar core set.
Chest / Bust
Measured flat, side seam to side seam, then doubled — typically about 2.5cm (1in) below the armhole. On fitted styles this sits close to the body measurement plus a modest ease allowance. On oversized silhouettes, that ease allowance can be substantial, and it should be a deliberate design choice rather than something that happens by accident during pattern-making.
Shoulder Width
Measured seam to seam across the back. Shoulders don’t stretch the way a torso does, so even a small variance here changes how a garment sits noticeably. It’s worth holding this point to a tighter tolerance than most others on the spec sheet.
Body Length
Measured from the highest point of the shoulder (HPS) down to the hem. Front and back length can differ slightly on styles with a dropped hem at the back — if that’s part of the design, say so explicitly rather than leaving it to be inferred from a flat sketch.
Sleeve Length
Measured from the shoulder seam to the cuff edge, along the sleeve, with the arm relaxed at the side. On raglan and dropped-shoulder styles, be clear about where the shoulder-seam reference point actually is, since there isn’t a traditional seam in the same place.
Waist and Hip
For bottoms, measured flat across and doubled, at the relevant point of the waistband or hip. Where exactly the waist is measured matters more than most new brands expect — a low-rise and a high-rise style measure from a different reference point entirely, even if the finished waist circumference is identical.
Rise, Inseam and Outseam
Front rise and back rise are usually different (back rise runs longer) and are worth specifying separately rather than as one generic rise figure. Inseam runs from the crotch seam to the hem; outseam runs from the top of the waistband to the hem along the outer leg. Together, these three numbers shape how bottoms actually sit and move far more than the waist measurement alone.
Setting Tolerances
No production run is measured to the millimeter, and it shouldn’t need to be. Tolerance defines how much variance is acceptable at each point of measure before a garment is considered out of spec. As a general starting point, wovens are often held to a tighter tolerance than knits, since knit fabrics stretch and relax after cutting in ways that wovens don’t — but exact figures vary by fabric, garment type, and factory, and shouldn’t be treated as fixed across every program.
The tolerance conversation is worth having directly with your manufacturer, for your specific fabric, before bulk production — not after a shipment fails your own quality check.
Building a Size Chart
A size chart is the practical translation of your target customer into numbers a factory can produce against. Some brands start with a manufacturer’s existing block and adjust; others build their own grading logic from body-measurement references plus an intended ease per style. Once you have some production volume behind you, building and owning your own size chart is usually worth the effort — sizing is genuinely part of how a brand fits into a customer’s life, not just a technical detail.
A usable size chart needs a few things to actually function day to day:
- Every point of measure your tech pack references — not a partial list that leaves gaps a pattern maker has to guess at
- Garment measurements, with an approximate resulting fit description where it’s useful for customers
- Consistent units — both cm and inches if you sell to international customers
- Version control, since size charts do get revised as fit feedback comes in, and old and new versions can’t be allowed to circulate at the same time
Grading Considerations
Grading is the rule that expands a base sample size into a full size run. A common mistake is applying the same increment to every point of measure across every size — in practice, chest and waist typically grade by a different amount than length, and sleeve length rarely grades at the same rate as body length. Treating every measurement as if it scales identically is one of the fastest ways to end up with a garment that fits well in the sample size and progressively worse at either end of the range.
Before committing to a grade rule for bulk production, it’s worth fit-testing at least your smallest and largest sizes, not only the sample size. That’s the only reliable way to confirm the grade rule actually holds up at the edges of the range, which is where most fit complaints originate.
Common Measuring Mistakes
- Body measurements used where garment measurements should have been specified
- The same tolerance applied to every point of measure, regardless of fabric behavior
- No agreed measuring method — garments measured laid flat by one team and relaxed by another produce different numbers for the same piece
- A grade rule based on assumption rather than an actual fit test
- A size chart updated without updating the tech pack that references it, so the two documents quietly disagree
Fit Testing Beyond the Tape Measure
A flat measurement confirms a garment matches its spec sheet. It doesn’t confirm the garment actually fits well on a body, which is a different question. Fit testing — putting a sample on real people who match your target size range, not just a single fit model — catches problems a tape measure alone won’t: a sleeve that measures correctly but binds at the shoulder, a hem that sits at a different height depending on the wearer’s proportions, a waistband that reads as comfortable on paper but not in motion.
This matters more for some garment categories than others. Simple, loose silhouettes tolerate more variance; anything fitted, structured, or built around a specific proportion (a cropped length, a tailored waist) benefits from testing on more than one body before a grade rule is finalized.
Communicating Measurements in a Tech Pack
The point-of-measure page in a tech pack is, in practice, the working contract between a brand and a factory. Ambiguity here is expensive later, not cheap. A good POM page pairs a labeled flat sketch — showing exactly where each measurement applies on the garment — with a table listing the garment measurement per size and a tolerance for each point. Vague callouts like “medium length” aren’t something a pattern maker can actually cut to; precise numbers, tied to a clear diagram, are what keep a sample and a bulk run consistent with each other.
Where This Actually Pays Off
None of this guarantees a perfect fit on the first sample — fit development is iterative by nature. What it does is remove the ambiguity that turns a normal round of fit revisions into a drawn-out back-and-forth with your factory. A clear, well-documented measurement standard is one of the few parts of production a young brand can get right early, and it keeps paying off every time you reorder.