Quick answer
Check what the chart measures before choosing a letter size. Body measurements and finished-garment measurements describe different things. A size label alone cannot tell you whether an item will fit.
OopBuy Spreadsheet sizing: garment measurement diagram
Measurement illustration: 1 chest width, 2 body length, 3 shoulder-to-cuff sleeve length. Use the seller’s own diagram for the exact starting points.
Step-by-step checks
Identify the measurement type
UNIQLO distinguishes body measurements from finished-garment measurements. Use that distinction to read the seller’s chart; UNIQLO sizes and tolerances are not rules for other sellers.
Measure a comparable garment
Lay a similar item you already wear flat without stretching it. Record the same measurements and units the seller uses. Comparing a T-shirt with a heavy jacket is a poor reference for how either should fit.
Match the starting points
Flat chest width is measured across the garment, not around your body. A sleeve measured from the centre back of the neck differs from one measured from the shoulder. Keep these methods separate.
Resolve gaps before ordering
If the chart omits a definition or gives conflicting values, ask the seller or agent for the measurement method and selected size. Request a measurement photo when available; confirm any service conditions first.
Apply it to your listing
Example to work through
Suppose your reference hoodie fits across the chest but its sleeves are too short. Compare both measurements separately. A larger letter size might change the chest and length as well; it does not isolate the sleeve adjustment you want.
Avoid this shortcut
Do not compare a body circumference with a flat garment width, or mix measurements taken from different sleeve starting points. A larger number is only meaningful when the method and units match.
Question to adapt
Could you confirm the selected size’s flat chest width and sleeve measurement, including the starting point? Is a measurement photo available, and is there a fee?
These are illustrative scenarios and suggested questions, not real customer orders or service promises.
Your checklist
Record your reference garment and the seller’s values side by side. Empty fields are for your notes; this worksheet does not calculate or guarantee a size.
Record a similar garment whose fit you already know.
Measure across the laid-flat garment at the points shown in the seller’s diagram.
Check whether the chart measures from the centre back or an off-centre shoulder point.
Write down whether the measurement starts at the shoulder or centre back.
Keep centimetres and inches separate. Use only a tolerance actually stated by that seller.
Notes stay in this page and are not sent anywhere. Print them before leaving; they are not saved after a reload.
Common questions
Should I always size up on OopBuy?
No universal adjustment follows from using an agent. Compare the specific listing’s chart and intended cut with your reference garment, then confirm unclear measurements.
Can a size label or photo replace the chart?
A label identifies the selected option; a photo may help with visible proportions. Neither supplies a complete measurement definition or guarantees fit.
Sources & scope
Source for the body/garment distinction and measurement starting points. The worksheet and comparison steps are our editorial guidance.
Reviewed on the date above. Platform options can change; confirm the information shown for your listing or parcel before acting.