01 / NAME THE MEASUREMENT
Is the chart describing a body or a garment?
A chart can describe the body an item is intended to fit or the dimensions of the finished garment. These are different quantities. A body chest measurement goes around a person; a flat garment width measures across the item.
UNIQLO UK’s size-chart explanation distinguishes body and product measurements and recommends comparing a similar garment you own with the individual item’s chart. This is a useful method; UNIQLO’s size labels and product dimensions do not establish the sizes of a separate merchant’s listing.
For the actual item, identify the chart type, unit and measuring instructions. Check that the chart belongs to the selected model and option. A chart copied from another product, or a size letter without dimensions, leaves the comparison unresolved.
| Chart label | Question to resolve |
|---|---|
| Chest / bust | Is this body circumference, garment circumference or a flat garment width? |
| Length | Where does the tape start: centre neckline, highest shoulder point or another stated point? |
| Sleeve | Does it start at the shoulder seam or centre back neck? |
| Units | Are the values in centimetres or inches? Are all compared values using the same unit? |
02 / USE A COMPARABLE ITEM
Lay out a garment whose fit you already know.
Choose a similar type of garment: a T-shirt for a T-shirt comparison, or a hoodie with the layering room you want for a hoodie comparison. Note what you like about its fit and where you would prefer more or less room.
Put it on a clean flat surface and smooth the wrinkles. Keep the tape readable, avoid pulling the garment out of shape and record the method with each value. Compare its condition too: a garment that has changed after washing may describe your preferred current fit rather than its original advertised size.
UNIQLO Hong Kong’s measuring guide defines flat body width below the armholes and shows that length and sleeve endpoints differ by measurement type. Our schematic illustrates two dimensions; follow the actual seller’s diagram if its method differs.
B — One length method. Centre back neckline to hem.
Original schematic, not a product photo or size chart. Follow the seller’s specified endpoints.
Record several relevant dimensions rather than choosing on chest width alone. Length, shoulder and sleeve measurements may change differently across sizes. If a chart provides only some dimensions, keep the missing ones as open questions.
03 / COMPARE THE SAME QUANTITY
A difference is useful only when the methods match.
Place your reference measurements beside each candidate size from the seller’s chart. Confirm matching endpoints and units before subtracting the values. A flat width of 52 cm cannot be directly compared with a body circumference of 104 cm as though they describe the same thing.
| Dimension | Reference → candidate |
|---|---|
| Flat width | 52 cm → 54 cm: candidate is 2 cm wider across. |
| Same-method length | 70 cm → 72 cm: candidate is 2 cm longer. |
Those differences do not prove that the candidate will fit. Consider the other dimensions, garment construction and the fit you want. A stretch fabric, dropped shoulder or curved hem can make a simple numerical comparison incomplete.
If the seller states a measurement tolerance, read it for that specific item. Do not import another retailer’s tolerance or assume every seller uses the same one. There is no universal “Superbuy size”: the agent workflow does not make every merchant’s S, M or L equivalent.
04 / KEEP ONE UNIT IN YOUR NOTES
Convert units, not size labels.
NIST’s length-unit reference gives the standard inch as exactly 25.4 millimetres, equivalent to 2.54 centimetres. Multiply inches by 2.54 to get centimetres; divide centimetres by 2.54 to get inches.
20 in × 2.54 = 50.8 cm
52 cm ÷ 2.54 ≈ 20.47 in
These are unit-conversion examples, not product measurements. Keep the original value and unit in your notes; extra decimal places do not make a tape reading more accurate.
Converting centimetres to inches does not convert a merchant’s medium into a US, UK or European clothing size. Use the individual chart to compare dimensions.
05 / DISTINGUISH FOOT LENGTH FROM A LABEL
Use the shoe chart’s own definition.
Confirm whether a shoe chart uses foot length, an insole measurement or a labelled size system. These describe different things. Check the specific chart and its instructions before comparing a familiar EU, UK, US or CM label.
For a foot-length method, Nike’s official men’s footwear guide describes standing on paper on a hard, flat surface with weight balanced, marking the outermost heel and longest toe, and measuring between those points. It calls for measuring both feet and using the longer measurement with its chart.
Nike also distinguishes its CM/JP box label from the chart’s foot-length value. That is a reason to read definitions carefully, not permission to apply Nike’s authentic-product chart to a separate listing simply because its title contains the brand name.
Ask for the selected seller’s exact model chart. If it asks for another measurement, follow that method rather than substituting foot length. Do not use a generic conversion table to settle an ambiguous listing.
06 / RESOLVE THE GAP
Ask for the method before guessing a size.
If the chart is absent or unclear, ask the seller or agent for the exact item’s size information and measuring endpoints. Keep the source URL and option with the question. If the item is already in the warehouse, ask whether a matching measurement photo is available and what its service terms are.
The QC photo guide shows how to make a precise measurement request. A clear comparison reduces ambiguity; it still does not replace trying the garment or establish a fit guarantee.
THE QUICK ANSWERS
Make the size decision specific.
Should I always size up when using Superbuy?
No universal step applies to every merchant and item. Compare the exact model’s chart, matching measurements and the fit you want; ask about missing information.
Is flat chest width the same as my body chest measurement?
No. One measures across a garment; the other goes around your body. Establish what the chart describes before comparing values.
Can I use a brand’s official shoe chart for every listing?
Use the chart that actually applies to the selected item. A brand name in a directory title does not verify authenticity or establish that the merchant follows the brand’s measurements.
Apply these measurements to a shortlist
SOURCES & SCOPE
References for the measuring method.
- UNIQLO UK: body and product measurements — distinguishing chart types and comparing an existing garment.
- UNIQLO Hong Kong: measurement methods — flat measurement position and different length or sleeve endpoints.
- Nike: men’s footwear size guide — foot-length method and the distinction from the CM/JP label.
- NIST: SI units — length — the inch’s standard length.
Sources reviewed 13 October 2026. These references explain methods; they do not validate another merchant’s dimensions. The comparison example and schematic are original editorial illustrations. We have not measured, worn or verified the fit of the catalog products.