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Quick answer
- Use the exact listing's chart and check what each dimension measures.
- Compare a familiar garment using the same measuring method.
- Foot length, insole length and a printed CM label are not interchangeable.
A familiar label such as M, UK 9 or EU 43 is a convenient starting point, but it does not answer every fit question. Before comparing two finds, make sure their measurements describe the same thing.
This guide provides a comparison method. It is not a universal conversion chart, and it does not certify the dimensions of any item in the directory.
Read what the chart actually measures
For clothing, distinguish body measurements from measurements of the garment. Then check the unit and the endpoints. “Chest” might mean a circumference in one chart and a flat width in another; ask if the listing does not explain it.
Create a small comparison note:
| Field | Your reference | Candidate listing |
|---|---|---|
| Measurement method | Body or flat garment | Same method, or unresolved |
| Unit | cm or inches | Convert before comparing |
| Top | Width, length and sleeve | Matching endpoints |
| Bottom | Waist, rise and inseam | Matching endpoints |
| Intended fit | How you want it to sit | Information still needed |
Do not fill an empty seller measurement with a guess based on the product photograph.
Compare a garment you already like
Choose a similar garment with a fit you understand. Lay it in a consistent position and note how you measured it. Compare the dimensions that actually matter to you, rather than trying to infer a complete fit from one number.
Illustrative example: your favourite hoodie measures 56 cm across between the specified underarm points. A candidate lists 52 cm using the same flat-width method. That is 4 cm narrower in this one dimension. It does not establish the sleeve length, fabric stretch or how the whole garment will fit.
If one measurement is decisive, obtain it before accepting the item. A statement such as “true to size” leaves the measuring method and your preferred fit unexplained.
Keep footwear measurements distinct
Foot length and the CM figure printed on a shoe label are not always the same measurement. Measure both feet and check how the chart for your exact item handles differences between them.
That is a useful reminder about measurement types, not evidence that another seller’s shoe follows Nike’s chart. Foot length, insole length and the size printed on a box should be recorded separately. If a listing asks for one, do not silently substitute another.
Ask which chart applies to the exact model and option. A conversion copied from another shoe or another seller can leave the original fit question unanswered.
Request a measurement that can be checked
You can request specific size details through the detailed-photo service. Write the endpoints rather than asking only for a “size photo.”
Please measure this item flat, without stretching it, from [start point] to [end point]. Please use centimetres and show the whole ruler, including both endpoints. My comparison garment was measured the same way.
For a shoe, specify whether you need the removable insole or a different dimension, and ask whether that measurement is feasible. Do not assume the warehouse can perform every requested test or dismantling step.
Decide what the remaining uncertainty means
Warehouse photos do not guarantee that size deviations are absent. Use a visible measurement to reduce a specific uncertainty, not to promise a perfect fit.
If the chart is missing, the measuring method is unclear or the seller cannot confirm a crucial detail, leaving the item off your shortlist is a reasonable outcome. Good sizing research sometimes ends with choosing a better-documented option.
Should I always size up?
No single instruction fits every model, chart and fit preference. Resolve the chart and the relevant measurements first; an automatic size change may solve the wrong problem.