Between two sizes? How to choose the right clothing size
Decide between M and L, or two numbered sizes, using the item's size chart, your preferred fit, and measurements from clothes you already wear.
5 min read · Includes a free toolTHE FIT PREVIEW FIELD GUIDEClothing size guides.
Clothing size guides.
Find your fit with less guesswork.
Clothing size guides for the moments between “I like it” and “will it fit?” Read a chart, compare measurements, and choose your next step.
Free to read · No account needed · Inches and centimetres
*Use the retailer's stated starting point for length.
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Fit fundamentals
Read the chart, understand size labels, and resolve common sizing questions.
How to read a clothing size chart: body vs garment measurements
Understand body size charts, garment measurements, flat widths and fit allowance before choosing a clothing size online.
5 min readUS, UK and EU clothing sizes: how to compare international labels
Compare US, UK and EU clothing labels using the retailer's chart. Learn why letter sizes and international size conversions need a measurement check.
4 min read · Includes a free toolWhy am I M in one brand and L in another?
Understand why clothing size labels differ across brands, markets and cuts. Build a useful fit reference from measurements instead of converting every medium to another medium.
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Brand guides
Find the right source for the brand, department and market you are shopping.
Zara size guide: how to choose a size for the item you want
Use Zara's product measurement guide and Find your size tool, then check fit, fabric and missing measurements before ordering.
4 min readNike clothing size guide: choosing tops and layers
Understand Nike's men's tops body size chart, between-size advice and fit notes. Keep clothing measurements separate from shoe sizing.
4 min readDoes H&M run small? How to check the size of your item
Check H&M sizing using the correct department, fit description and measurements. Compare fitted and relaxed styles before deciding to size up.
4 min readUNIQLO size guide: body size, product size and fit
Use UNIQLO's US product measurements to compare a shirt or trousers you own. Understand body-size labels, market differences and oversized cuts.
4 min read · Includes a free tooladidas clothing size guide: tops, layers and body charts
Read adidas clothing charts by department and garment type. Compare body measurements, intended fit and length before choosing a size.
4 min readASOS size guide: own-brand charts and marketplace sizing
Understand which ASOS size chart applies to your item, what body measurements mean, and why an ASOS shirt size may not transfer to every label sold there.
4 min read · Includes a free toolLevi's size guide: waist, inseam, fit and shrinkage
Understand Levi's jeans sizing beyond the waist label. Check the right chart, rise, seat, thigh, inseam and any Shrink-to-Fit instructions.
4 min read · Includes a free toollululemon size guide: leggings, tops and different fit charts
Choose the correct lululemon chart for leggings or tops. Separate body measurements, Contour Fit, length and intended support when comparing sizes.
4 min readSHEIN size guide: product charts, fit and One Size
Check the sizing information on a SHEIN item, distinguish body and product charts, and understand why One Size is not a fit guarantee.
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Brand comparisons
Compare like-for-like chart information with its limits in view.
Nike vs adidas sizing: men's tops charts compared
Compare selected Nike and adidas US men's tops chest ranges. See why the same letter can point to different body sizes without proving one brand runs small.
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Garment fit
Check the parts of a T-shirt, jeans or blazer that matter to your preferred fit.
How should a T-shirt fit? Chest, shoulders and length
Check a T-shirt's chest width, shoulder shape, sleeves and length against the look you want. Compare a favourite tee with a new item using a free tool.
4 min read · Includes a free toolHow should jeans fit? Waist, rise, thigh and inseam
Separate jeans size from jeans shape. Check waist comfort, rise, seat, thigh and hem length, with a worked inseam comparison in inches and centimetres.
4 min read · Includes a free toolHow should a blazer fit? Shoulders, chest and layers
Check a blazer over the layer you plan to wear. Compare shoulders, chest, sleeve and body length without confusing a body chart with jacket measurements.
4 min read · Includes a free toolOversized fit sizing: should you buy your usual size?
Understand oversized versus sizing up, slim versus regular fit, and how width, dropped shoulders and length work together when choosing a silhouette.
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Measurement tools
Turn measurements into useful comparisons, with clear worked examples.
How to measure clothes for online shopping
Measure a shirt or pair of trousers you already own. Learn chest width, waist width, inseam and length, with an inches-to-cm converter.
5 min read · Includes a free toolPit-to-pit vs chest circumference: measure and convert
Learn what pit-to-pit means, when doubling a flat chest width is useful, and why garment circumference is different from your body chest. Free calculator included.
4 min read · Includes a free toolClothing ease explained: compare body and garment chest
Calculate the difference between finished garment chest circumference and body chest. Understand positive, zero and negative ease without treating it as a universal fit score.
4 min read · Includes a free toolHow these guides are prepared
FitPreview combines linked retailer guidance with practical measurement explanations and illustrative examples. Brand guides are independent; FitPreview is not affiliated with the retailers covered here. These guides do not claim hands-on testing of every product.
Retailer instructions apply to their stated item, department and market. Examples labelled illustrative are not brand size charts. Check the linked source and current product page before ordering. We revise the review date when the content is checked or changed.