How to Spec Sleeve Opening Circumference on Tees

What is sleeve opening circumference?

Sleeve opening circumference is the distance around the finished edge of a sleeve. For a plain, non-elastic T-shirt sleeve laid flat without stretching, buyers often specify half of this measurement as the sleeve opening width. The distinction matters: a 20 cm flat opening represents approximately a 40 cm circumference. A supplier reading 20 cm as the full circumference would produce a very different sleeve.

For heavyweight cotton tees, define the measurement on the finished garment, identify whether it is taken before or after the agreed wash, and include a drawing. This guide provides a suggested buyer workflow, not a universal apparel tolerance standard. The pattern technician and buyer should approve the final method for the specific construction.

Write an unambiguous point of measure

Give the opening its own point-of-measure code in the tech pack. State the units, garment condition, endpoints, and whether the result is a flat width or full circumference. Lay the garment on a smooth surface, align the sleeve naturally, and remove folds without pulling the fabric. Measure straight across the finished opening at the location shown in the approved diagram. Record both sleeves separately if symmetry is part of the acceptance criteria.

A folded or curved opening, elasticated cuff, or asymmetric sleeve may require a different method. Do not silently substitute a straight-line width for a measurement along a curved edge. Agree the method on a physical sample and attach a photograph showing the tape position.

A worked example for the specification sheet

The following values are illustrative development targets, not Weavnora production specifications or published industry limits. A buyer developing a 240 GSM cotton tee might choose this starting point for sample review:

Under that example, a 20.4 cm flat measurement is within the stated width interval. Its approximate doubled circumference is 40.8 cm. If the tolerance is expressed as full circumference instead, convert the tolerance as well as the target: ±0.5 cm flat corresponds to approximately ±1.0 cm around. Do not copy the same numeric tolerance into both columns.

Turning this into an order? Weavnora develops heavyweight T-shirts for brands in North America and Europe. Check the heavyweight T-shirt page, then send your requirements for a quote and sampling timeline.

Compare opening width with upper-sleeve fit

Opening width and upper-sleeve width answer different questions. The opening controls the finished edge; the upper sleeve affects room around the arm closer to the armhole. A comfortable opening does not prove that the upper sleeve, sleeve length, or armhole is correct.

Compare the sample with the approved fit reference on the intended fit model. Check the sleeve with the arm relaxed and during normal movement. Record whether the desired silhouette is close, straight, or loose. Choose any pattern adjustment after reviewing those observations together, rather than widening the opening to compensate for an unrelated armhole problem.

Check washing and size grading separately

A production wash and a consumer laundering test are different stages. Record the production finishing recipe used for the approval sample. If the buyer also requires home-laundering dimensional stability, agree the test method, cycles, drying procedure, measurement points, and acceptance limits in writing.

AATCC TM150 addresses garment dimensional changes after home laundering. Its public scope does not supply a universal sleeve-opening target or tolerance. Ask the laboratory to report the selected conditions; do not label an informal wash check as a full standards-compliant test.

Review the full size chart rather than approving only size M. Specify the opening target for each size and confirm the smallest and largest sizes during development. Grading is a design decision: a single fixed increment should not be assumed without checking the intended size range and fit.

Buyer checklist before bulk release

1. Confirm that every document uses the same flat-width or circumference definition.
2. Approve the measuring diagram and garment condition.
3. Record actual left and right measurements on the fit sample.
4. Review opening width alongside upper-sleeve width and sleeve length.
5. Sign the size chart, tolerances, wash requirements, and sample revision.
6. Agree the inspection sampling plan and response to an out-of-tolerance result.

A sample approval is not evidence that every bulk piece has been measured. The inspection report should identify the sampled sizes, quantities, results, and disposition of failures. Keep the approved sample and measurement sheet available for comparison.

For a Weavnora development inquiry, send your drawing, size chart, fabric target, finish, quantity, and delivery destination through the RFQ form. The cotton jersey sourcing guide and washed T-shirt development page provide related starting points. Confirm commercial terms and the inspection plan in the project quotation.