Sizing is where new Oopbuy spreadsheet buyers most often go wrong. Labels are misleading; charts vary by seller; only measurements are reliable.
Why labels lie
Asian sizing conventions are not standardized across factories. One seller XL may fit like a US L; another seller XL may fit like a US M. Same label, wildly different fit.
The flat-measure method
- Pick a garment you already own and love.
- Lay it flat on a table.
- Measure chest width, length, sleeve length (for tops).
- For pants: waist, rise, inseam, thigh.
- Compare against the seller numerical chart, not the label.
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Category rules of thumb
- T-shirts and hoodies: Asian XL for US L.
- Shoes: about half a size below US.
- Pants: waist measurement is truth.
- Jackets: measure chest and length carefully.
What to do if the chart is missing
Ask the seller. Most respond within 24 hours with measurements for their specific listing.
The stretch factor
Knit fabrics stretch; woven do not. A 90 cm chest on a woven jacket is smaller than 90 cm chest on a knit hoodie. Adjust expectations.
Calibration first
Order T-shirts before anything expensive. Cheap way to calibrate on Oopbuy sizing without financial risk.
Where to shop
Open the homepage with the measurement chart open in another tab. Beginners: pair with the starter framework.
Return to our Oopbuy Spreadsheet homepage for the full library of guides and the latest sheets.