Boonbuy Clothing Size Guide: Compare the Measurements
Start with a similar garment you already enjoy wearing. A few measurements can make a listing easier to compare than a familiar size letter alone.
The first question is what the chart measures. A body chart describes the wearer; a garment chart describes the finished item. UNIQLO’s measurement guidance distinguishes these two and recommends comparing product measurements with a similar garment. That distinction is useful when reading any listing, but another seller may use different measuring points. Body and product measurement guide.
Identify the chart before comparing numbers
Look for units, a diagram and an explanation of each column. Check whether a chest figure is a circumference or a flat width, and whether the chart refers to your body or the clothing.
For example, 56 cm across a laid-flat chest is a different measurement from 56 cm around the body. Doubling a flat width can describe an approximate garment circumference under that measuring method; it does not turn the result into a body size recommendation.
If the listing leaves this unclear, ask which chart it uses before selecting a size.
Measure a comparable item
Choose a reference with a similar purpose and construction: a hoodie for a hoodie, or trousers with a comparable waistband for trousers. Lay it flat on a clean surface, smooth the fabric and follow the same measuring points shown by the seller.
Record the unit beside each result. Use the same approach for every candidate, rather than mixing a measurement from the back of one garment with a different starting point on another.
| Item | Useful measurements to compare | Question to resolve |
|---|---|---|
| T-shirt or hoodie | Flat chest width, body length, shoulder and sleeve | Where does each measurement begin? |
| Jacket | Chest, shoulder, sleeve and length | Does the cut leave the layering room you want? |
| Pants | Waist, rise, inseam and leg opening | Is the waist measured flat, relaxed or stretched? |
A dropped shoulder changes where a sleeve seam sits. A raglan sleeve may be measured from the neckline instead. An elastic waistband also needs a stated measuring condition. Treat those as different constructions when choosing your reference.
Compare one measurement at a time
The table below uses invented measurements to compare your reference hoodie with candidates A and B. It is a reading exercise, not a size chart for an actual product.
| Measure (cm) | Yours | A | B |
|---|---|---|---|
| Flat chest width | 56 | 54 | 58 |
| Body length | 68 | 68 | 72 |
| Sleeve from shoulder seam | 61 | 62 | 60 |
Candidate A is narrower at the chest than the reference. Candidate B is wider and longer, with a slightly shorter sleeve measured from the stated point. Neither is automatically the better fit: the desired silhouette and matching construction still matter.
A size letter would hide these differences. Keep the measurements and your preference together in your notes.
Ask a question that can be answered
Replace “Does this run big?” with a request tied to a size and a measurement:
For the selected size, is the chest figure a flat armpit-to-armpit width or a full circumference? Please confirm the body-length starting point as well.
For a trouser listing, ask whether the waist measurement is relaxed or stretched and how the inseam was measured. A seller may provide a diagram or clarify an existing chart without needing a new measurement.
If the intended fit remains unclear, compare another listing that gives more usable information.
Use warehouse photos to check the selected item
After an item reaches the warehouse, compare the order’s size label with your selected option. Where a measurement matters, ask whether a clearly framed ruler photo is available and what service charge applies.
The photo should show both endpoints and the ruler. It can help answer a specific dimension question; it cannot demonstrate comfort, movement or the way the garment will drape on your body.
Our QC photo guide explains how to separate missing information from a visible mismatch.
Keep a small fit record
Save the listing identifier, chosen size, chart units and the measurements that drove your choice. Add a short note such as “longer than my reference hoodie” rather than recording only “size M.”
Should I always order a larger size?
Use the actual chart and intended cut. A fixed rule about ordering one or two sizes larger cannot account for different garment designs.
What if only body measurements are provided?
Follow the instructions for that body chart. Keep body measurements and laid-flat garment measurements in separate records.
Continue with Boonbuy hoodies spreadsheet, Boonbuy T-shirts spreadsheet, Boonbuy jackets spreadsheet or Boonbuy pants spreadsheet, then check the complete listing for your chosen option.