Buyer guide · 4 min read

Men’s Underwear Size Grading for Private Label

A private-label size run is a grade you send. It is not a chart this site publishes. The size names a customer sees and the finished measurements the factory sews are two different documents. This note says what to write, what a base-size sample does not approve, and how plus size differs from a longer leg. It does not add a waist range, a grade increment or a tolerance.

By the YXLP product development team · Published November 1, 2026

Keep the body chart separate from the finished spec

The body chart is how you label sizes for the people who wear the garment. The finished spec is the set of measurements the sample is checked against. A label such as M can sit on more than one finished waist, depending on the cut, the cloth and the ease you want. Send both documents, and say which one is which.

YXLP does not publish a house size chart. The boxer brief style page already says that buyers usually map labels to body waist, and that United States, United Kingdom and European Union labels are not the same convention. That sentence is not a finished grade. Do not copy it into a spec. Bring the chart you actually sell.

What to write before anyone grades the pattern

Grading is the rule for how each measurement changes from one size to the next. Take it from your chart. A rule that is right for the waist can be wrong for the leg opening. Thighs do not have to scale in a straight line with the waist. The tech pack guide names the points of measure and shows where a tolerance column sits. This page does not replace that table and does not fill it in.

Lines to separate on a private-label grade. None of these cells is a published measurement.
LineWrite thisDo not treat as the grade
CutBrief, trunk or boxer briefA style name copied from an old title
Body chartThe size names your customer seesA finished garment measurement
Base sizeThe size you will approve firstApproval of every other size
Finished specRelaxed and stretched values for the base size, at the points in the tech packA number guessed from a photo
Grade ruleHow each point changes to the next size, from your chartOne change applied to every point
Proof sizesThe smallest and largest, or the end size you must seeA base-size sample alone
WaistbandWidth and logo repeat on the sizes you sellArtwork standing in for the measurements

Private label does not include a grade

Private label is your waistband, labels and pack on an agreed body. The grade is still yours to send. A logo does not set the waist, the rise or the leg opening. A plain sample does not approve a branded band, and a branded band does not approve the size run.

The first-order tech pack checklist lets you lock the base size and the sizes you intend to sell before the graded table for every other size is finished. Leave that table open only if the quotation says so. Do not leave it open into bulk. Printed, woven and covered bands are a separate decision on the custom waistband brief and the waistband options guide. A narrow ribbed band in a photo is not a method.

Plus size is a grade, not a longer leg

Use the plus-size brief when the run goes past the sizes you already sell. Send the chart, the finished measurements and the size that must be sampled at the end of the grade. The two catalog records titled plus size are a no-leg brief set and a side view of a printed boxer brief. Neither shows an extended fit.

  • A longer inseam is a leg length. It is not a bigger body. Use the longer-leg brief for the length.
  • A seamless body and a cut-and-sew body rarely share one grade. Say which construction the chart is for.
  • A base-size approval does not approve the largest size.
  • Fiber content is still a separate line. Cotton in an old title is not a care label.

What to measure before you approve bulk

Agree the same points of measure and the same method on the base size and on the proof sizes. Record the result against the graded spec, not against a general impression of fit. The quality page is the buyer checklist for that agreement. It does not include a laboratory test or a certificate with every order. The inspection guide is where you plan how a bulk lot is sampled. A pass on one size is not a pass on the run.

A practical order of work

  1. Name the cut the grade applies to.
  2. Attach your body-size chart and say it is not the finished specification.
  3. Record finished measurements for the base size, and mark relaxed and stretched where the point stretches.
  4. Write how each point of measure changes from that size to the next, using your chart.
  5. Name the smallest and largest sizes the sample must include.
  6. Approve those measurements before bulk production.

How many pieces of each size you buy is a size curve, not a grade. Plan that split on the size-curve guide after the measurements exist. Destination pages say which country the labels follow. They do not add a size chart.

Common questions

Does YXLP publish a men’s underwear size chart?

No. Send the body-size chart you sell and the finished measurements for the base size. The boxer brief style page describes how buyers usually label sizes. It is not a finished grade, and this page does not repeat those labels as a chart.

Can one sample approve the whole size run?

No. Approve the base size, then check the smallest and largest sizes, or the end size you named. A grade rule for the waist can be wrong for the leg opening.

Is plus size the same as a longer leg or a private-label logo?

No. Plus size is the grade past your usual sizes. Leg length is the inseam. The logo is the waistband artwork. Each one is written separately. Photos titled plus size do not show an extended fit.

Where do the finished numbers go?

In the tech pack, next to the points of measure, after you have approved them on a sample. The first-order checklist says which of those lines to lock before you compare quotations. Empty cells stay empty until you have a measurement.

Ready to brief a style?

Send a reference garment or sketch, the quantities you are considering and your destination. The quotation will state what is included and how minimums are counted.