Guide 03 · Sizes & Categories

Using an Oopbuy Spreadsheet to Compare Clothing Sizes

To compare clothing sizes in an Oopbuy spreadsheet, keep two columns side by side: your body measurements and the garment measurements listed for each item. When both are written in inches on the same row, differences in fit and units become obvious instead of hidden behind a single label.

Independent guideUpdated October 2026For shoppers in the United States

Body measurements versus garment measurements

Body measurements describe you; garment measurements describe the item. A size tag alone says very little because brands cut differently. Record chest or bust, waist, hips, shoulder and sleeve length for you, then copy the garment numbers from each item page onto the same row. When the two sets are close but the style is described as relaxed, expect extra room; when the description says slim, expect less.

Reading a size chart without guessing

A common trap is a chart that lists a "flat" measurement, which is roughly half the full circumference. If the numbers look impossibly small, check whether the chart means flat or around before assuming the item will not fit.

What to confirm with a seller

• Whether the chart is flat or full circumference.
• Exact material and expected stretch.
• Whether the model wore a sample size, and which one.
• Fit intent: slim, regular or relaxed.
• Return or exchange terms, if any.

Shoes follow a similar logic but use different inputs, so pair this with Oopbuy spreadsheet sneaker sizing. The list itself should already have measurement columns from building a shopping list.