A size chart helps only when you know what its numbers measure. Before choosing a size through a LitBuy spreadsheet, identify whether the chart describes your body, the finished garment or a recommended range. Then compare it with a suitable reference using the same units and endpoints.
Treat the chart attached to the selected product as the starting point. A size letter from another purchase is not enough to choose a different garment, even when the two listings use similar photographs.
First label the numbers
For each measurement, establish three things: what is being measured, where the measurement starts and ends, and which unit is used. A number labelled only “chest” may need clarification before you compare it with a body circumference or a flat garment width.
For example, a hypothetical chart showing a 56 cm flat chest width is not showing a 56 cm body circumference. Doubling that flat width gives 112 cm as a simple geometric comparison, but does not turn it into a recommended body measurement or guarantee fit. Garment shape and the space you want inside it still matter.
Do not silently convert an unclear chart into your preferred interpretation. Ask for the method when that uncertainty could change the size you choose.
Pick a useful reference garment
Use something whose fit you understand and whose construction is comparable. A fitted shirt is a poor reference for the body shape of a loose outer layer unless you deliberately account for the difference in use. Measure the reference without pulling or stretching it, following the product chart's method as closely as possible.
Write down what you want to keep or change: more room through the body, a shorter hem or a different trouser length. That makes the comparison more specific than “I usually wear medium.”
| Dimension | Clarify before comparing | Common source of mismatch |
|---|---|---|
| Chest | Flat width or circumference; exact placement | Comparing garment width directly with body circumference |
| Body length | Starting point and whether collar is included | Mixing shoulder-to-hem with another endpoint |
| Sleeve | Shoulder seam or neck as the starting point | Comparing raglan and set-in sleeves without matching methods |
| Waist | Body range or garment measurement; relaxed or stretched | Treating an elastic waist as a fixed, universal fit |
| Trouser length | Inseam, outseam or total length | Comparing different routes along the garment |
Choose a size from more than one dimension
Check the measurements most likely to affect your use together. A top may have the body room you want but sleeves longer than your reference. Trousers may have a suitable waist while differing in rise and leg shape.
Sizing up changes several dimensions, not necessarily in the proportions you want. Compare the actual size rows rather than assuming one step larger will solve the issue. If no available option fits the requirements that matter to you, another cut may be the better comparison.
For a layered outfit, compare an outer garment you already wear over a similar layer. For a matching set, examine the top and trousers separately. The jacket guide and tracksuit guide explain those cases in more detail.
Apply the method to a product, not an invented chart
The OG wide-leg trouser listing is a useful starting point for comparing waist, rise and leg proportions. Open the selected option and look for its current measurement information rather than using the hypothetical number above as product data.
Check the wide-leg trouser listing on OG
No measurement or size recommendation for this item follows from its title. If the chart is missing or unclear, resolve the relevant dimensions before choosing. The trouser guide explains why waist size alone does not describe the whole shape.
Use inspection measurements to resolve a specific doubt
If measurements are available through an inspection service, ask for the dimension you need with clear endpoints. “Body length from the stated shoulder point to the hem” is more informative than “check size.” Confirm the available service and any charge before requesting additional work.
Read the result in context. A photograph needs a visible scale and a clear method to support a measurement. Perspective, folds and a tape placed along a different route can make a comparison misleading. A size label confirms what the label says; it does not establish every physical dimension.
If a result appears inconsistent with the listing, preserve the relevant chart, selected option and measurement together when asking for clarification. Check the options available for that order before approving the next step. The QC photo guide covers the limits of visual inspection.
Keep shoes and accessories separate
Do not apply a clothing-width method to footwear. Foot length, insole length and outsole length describe different things. Use the product's stated sizing method and the shoe guide rather than assuming a universal conversion from a clothing size or another shoe model.
Accessories also need their own endpoints. A belt's total length is not necessarily its fastening length, and a strap's full length is not its drop. The accessories guide explains these distinctions.
Common sizing questions
Should I automatically size up when ordering?
No fixed rule replaces the selected product's measurements. Compare the relevant dimensions with a reference that suits your intended use.
Can height and weight alone select my size?
They do not describe every body proportion or preferred fit. Use any recommendation with the product's measurement information rather than treating it as a guarantee.
What if two chart rows both look workable?
Compare the differences that matter to you, such as sleeve or body length, and consider the intended layering. Do not choose solely from the size letter.
Does a matching measurement guarantee comfort?
No. Measurements help compare dimensions, while construction, material and personal preference also affect the result. Avoid turning a dimensional comparison into a wear-test claim.
Return to the LitBuy spreadsheet to choose a category, or use the buying guide to place sizing within the broader purchase sequence.
Related LitBuy reading: spreadsheet links.