OOTDBuy Spreadsheet Sizing Guide Without Guesswork

01

Do not mix body, garment and product measurements

Body measurements describe the person. Garment measurements describe a finished item laid flat or measured around. Foot and insole lengths describe different spaces. Write the measurement method beside every number so you do not compare values that were taken in different ways.

If a chart does not explain its method, compare it with any measurement photo or ask for clarification before treating the number as exact.

• Body: chest, waist, hips or hand circumference
• Garment: flat chest width, shoulders, sleeves and body length
• Footwear: foot length, insole length and usable width
• Bags: exterior dimensions, opening and strap range

02

Use a reference item you already own

Choose an item with the fit you want, not simply the same printed size. Lay it flat without stretching and measure the same points shown in the listing. A washed and regularly worn item is often a more realistic reference than a new garment’s label.

Keep the reference measurements in one note. Reusing them makes it easier to compare several spreadsheet rows without measuring again each time.

03

Check outerwear with layering room in mind

For puffer jackets, hoodies and coats, compare chest width, shoulders, sleeve length and back length. Consider what will be worn underneath; a jacket that matches a fitted shirt may not leave room for winter layers.

Thickness and fill can reduce usable interior space. A similar exterior width does not always create the same internal fit.

04

Compare the longer foot with usable interior space

Measure both feet and use the longer one. Compare the result with the listing’s method, then allow appropriate room for socks, lining and the intended use. Thick winter lining can reduce usable space even when the printed size appears familiar.

Do not convert across size systems repeatedly. Centimetres provide a cleaner comparison when the source chart explains whether the number refers to the foot or insole.

05

Account for stretch, weight and intended silhouette

Knitwear can stretch, drape or shorten differently from a woven jacket. Compare shoulders, chest and body length, then read the material note for context. Oversized and fitted are descriptions, not measurements.

For heavier knits, garment weight and texture can influence how the piece hangs. Use the dimensions to define the baseline and photos to understand the shape.

06

Measure the object or body part the accessory must fit

For bags, write down the largest object that must fit and compare it with the opening as well as the exterior dimensions. For beanies and gloves, use head circumference, palm width and hand length when a detailed chart is available.

One-size labels still have a usable range. Stretch, closures and strap adjustment should be treated as features to verify, not assumptions.

07

Record why a size was selected

Save the chosen option together with the exact measurements, reference item and intended fit. A short note such as “size selected from chest width and sleeve length” is more useful than recording only the label.

Recheck the live option before ordering because charts, variants and availability can change after a spreadsheet row was saved.