Approve the shoulder and armhole on a finished sample worn for its intended use. Check coverage, ease of movement and edge comfort together, then record how each measurement is taken. There is no single armhole depth or shoulder width that fits every body, knit structure or design. A top worn alone may need a different opening from a vest worn over a shirt.
A measurement chart makes the sample repeatable, but a flat measurement alone does not show how the opening sits when an arm moves. Agree the fit, the representative sizes, the underlayer and the acceptance conditions before releasing production. New Mexico State University’s clothing construction guide identifies adequate ease and the position of the armhole on the body as fit considerations. Its guidance is general garment advice, not a knitwear size standard.
Start with the intended use and a fit reference
Tell the supplier whether the top is worn next to skin, over a thin base layer or over a shirt. Specify the desired shoulder coverage and whether the silhouette should be fitted, relaxed or intentionally dropped at the shoulder. Share front, side and back references and an existing garment that demonstrates the desired fit, if available. A photograph can show an aesthetic direction; it cannot establish the required ease on a wearer.
Select a fit model or agreed group of wearers representing the intended size range. Record body measurements used for fit evaluation separately from finished garment dimensions. Neither a size label nor a single model guarantees fit across all customers. For a range with materially different proportions, plan additional representative size samples with the supplier instead of assuming the middle size proves both ends of the range.
Describe the expected armhole exposure as a design decision. If an undergarment or shirt may show when the arm is raised, identify what is acceptable for the intended styling. If coverage is important, specify the underlayer, posture and viewing angles for the review. Avoid making coverage promises for all bodies from one photograph.
Measure the garment in a consistent condition
Use a finished, relaxed sample after the agreed finishing process. Lay it flat without stretching, smooth wrinkles gently, and state whether the front and back are aligned. Mark the exact endpoints on a sketch: definitions vary between suppliers. Record the unit, method, target and tolerance for each point in the approved size chart. If the design has no shoulder seam, agree an alternative reference point before measuring.
| Record | Define before comparison | What to assess on the wearer |
|---|---|---|
| Shoulder width | Front or back measurement; endpoints at the agreed shoulder edges | Where each edge sits and whether it shifts during movement |
| Armhole depth | Vertical distance from an agreed shoulder reference level to the underarm point; specify level and endpoints. Record curved edge length separately if needed | Underarm clearance, friction and visible opening |
| Front and back opening | Named reference points or traced edge on the retained sample | Gaping or pressure at the front and back separately |
| Chest width | Flat measurement location below the underarm; do not confuse width with circumference | Balance between body ease and armhole appearance |
| Edge finish | Rib or other finish, width, construction and finishing reference | Curling, distortion and comfort at the opening |
The table is a suggested record, not a universal measurement method. A straight vertical depth is different from the length along a curved armhole edge; agree which is controlled. For a ribbed edge that contracts after finishing, measure the actual finished edge as well as the surrounding garment. Do not stretch an opening to a different tension on each sample and then compare the resulting numbers.
Review movement before changing the pattern
With the intended underlayer, observe the front, sides and back while standing naturally. Then ask the wearer to lift and lower the arms, reach forward and return to rest. Look for contact under the arm, visible openings, shifting at the shoulder and distortion that remains after the movement. Record the action and location of each observation. Stop if an action causes discomfort; this is a fit review, not a strength test.
A deep opening can increase exposure, while a high or tight opening may rub or restrict movement. A narrow shoulder can change the visible shape of the armhole; a wider shoulder can change its position on the arm. These are possibilities to evaluate, not automatic diagnoses. If an opening gapes, check the shoulder position, chest fit, front and back shapes, edge finish and sample handling together before deciding which part to change. Tightening the edge alone may reduce the opening while introducing pressure or distortion.
Use a consistent set of photos or marked sketches with the sample ID and size. For example, record “front edge stands away when arms rest” separately from “underarm rubs when reaching.” They are observations of different conditions and may need different adjustments. Ask the supplier to identify a proposed pattern or construction change and its expected effect; review the revised finished garment before accepting it.
Account for knit and finishing changes
The same chart can produce different wear behavior in a different yarn, stitch, edge finish or finishing route. Keep these variables in the sample record. A loose edge, heavy rib or firm join may alter the feel and appearance of the opening; a swatch can help compare materials but cannot establish the fit of the assembled top. Review the inside as well as the outside for bulky joins, uncomfortable seams or rough yarn ends at the underarm.
Agree an appropriate care process for the actual garment with the supplier. Measure and photograph the sample before and after the agreed process in the same relaxed condition, then repeat the relevant fit and appearance observations. A single trial is evidence about that sample and process, not proof of performance after every wash. If yarn, construction, dimensions or finishing change after approval, decide which checks must be repeated.
Approve the size range and release record
Give every sampled size a clear revision ID and keep the approved physical reference. Compare the shoulder, armhole and chest measurements against the size-specific chart, then compare the worn behavior under the agreed conditions. Record any grading change separately for each point; increasing every dimension by the same amount may change the shape or intended coverage. A pass in one size does not automatically approve another.
Before bulk release, record the approved garment, yarn and colour reference, size chart, edge construction, finishing, care trial, fit observations and unresolved exceptions. Agree who authorizes a change and which production samples or inspection checks will be compared with the reference. If a result falls outside an agreed tolerance, hold the affected decision for review rather than assuming a measurement alone explains the fit.
For an inquiry, share the style reference, intended wear and underlayer, target sizes, measurements and any shoulder or coverage concern. Include planned quantities by style and colour, destination and requested arrival date; ask which samples and checks are needed for your project. Explore WTBF’s sleeveless knitwear and vest options and send an inquiry with the reference and open decisions.
Related resource
- New Mexico State University: Clothing Construction Standards — general fit, ease and garment construction considerations.