First identify what the chart measures.
A body chart describes the wearer. A product chart describes the finished item. Comparing a flat garment width directly with a body circumference mixes two different measurements. Also check the unit, size system and the selected product version before reading a row.
UNIQLO’s product-measurement guide makes this distinction and recommends comparing a product chart with a similar garment you own. That is a measuring reference, not a chart for products in our catalog: use each seller’s actual information.
Keep US, UK, EU, centimetres and inches in separate fields. A measurement in inches converts to centimetres by multiplying by 2.54. Converting the unit does not convert an arbitrary size letter into a dependable fit.
Use one familiar garment as your reference.
Choose a similar item whose fit you like: compare a T-shirt with a T-shirt, or a hoodie with a hoodie that leaves the room you want. Lay it flat without stretching it. Follow the listing’s measurement points so that the numbers describe the same thing on both items.
| Measurement | Useful record | Potential mismatch |
|---|---|---|
| Chest width | Flat underarm-to-underarm width | A circumference or a different measuring height |
| Body length | Both endpoints, such as shoulder-to-hem | Back-neck-to-hem versus shoulder-to-hem |
| Shoulder & sleeve | The seam points and sleeve starting point | Dropped shoulders or a sleeve measured from the neck |
| Hoodie fit | Reference garment and intended layering | Comparing a slim tee with a roomy outer layer |
For a hoodie, consider what you intend to wear underneath as well as body length and sleeves. Fabric behaviour and construction can affect the result. A height-and-weight suggestion alone does not settle the proportions of a particular garment.
For shoes, separate foot length from the label.
Measure both feet from heel to longest toe using the chosen brand’s method, and keep the measurements with the relevant chart. A larger foot, width needs and the specific model all matter when deciding what to check next. Ask the seller about an unclear size system before selecting an option.
Nike’s footwear chart explicitly distinguishes foot length from the CM label printed on its shoe boxes. Its conversion applies to that chart; it is not a universal conversion for every shoe linked in a spreadsheet.
An insole measurement describes part of the shoe, not your foot. It may help compare two similar pairs when the measuring method is consistent, but it does not establish usable internal space or fit by itself. Keep foot length, insole length and the printed label in separate columns.
Turn an information gap into a specific question.
Save the listing URL, colour, version, chosen size and chart before ordering. Instead of asking “Does this fit true to size?”, ask for the missing chest width, sleeve endpoint or shoe-size system. If an item later reaches a warehouse, compare its identifiers and measurement photos with the selection you recorded.
A ruler in a photo is only useful when its endpoints and units are visible. An angled or incomplete view may need clarification. Our QC photo guide explains how to match the source and variant before using a picture as evidence.
Common sizing questions.
Should I always size up when using a Hipobuy spreadsheet?
No single rule covers every listing. Compare the actual product chart and the desired fit; sizing up can change length and sleeves as well as width.
Can I double a flat chest width?
It can describe an approximate garment circumference under a consistent flat method, but it is not the wearer’s body measurement or a guarantee of stretch and usable room. First confirm what the chart means.
What if the chart has no measurements?
Ask for the measurements you need. Keep the size unconfirmed if you cannot obtain them, or compare a different listing with clearer information.
Sources & method.
Checked 29 Oct 2026: UNIQLO’s guide for the body/product distinction and measuring concepts; Nike’s chart for its foot-length versus box-label distinction. The illustration, comparison example and recording method are original editorial work. Neither source verifies the size, material or authenticity of a catalog item.
Apply the checks to shoes, hoodies, T-shirts or women’s clothing. Then include the selected items in your parcel budget.