Quick answer: To choose the right clothing size online, measure your bust or chest, natural waist and fullest hips; compare those numbers with the specific retailer’s size chart; check the garment’s fit, fabric and product measurements; and read the return terms before buying. Your usual S, M or L is a starting point, not a guarantee.
That routine matters when shopping seasonal fashion sales: a tempting markdown is less useful if the item does not fit or cannot be returned. This practical guide explains how to measure, read different charts and make a more confident decision at checkout—without assuming that every brand sizes clothing the same way.
How to measure yourself for online clothing
Use a flexible tape measure, stand naturally and keep the tape level. Measure over light clothing or directly over appropriate undergarments, without pulling the tape tightly. Record the result in both inches and centimetres if you shop international stores.
- Bust or chest: Measure around the fullest part, keeping the tape horizontal across your back.
- Waist: Measure around your natural waist rather than assuming it is where a particular pair of trousers sits.
- Hips: Measure around the fullest part of your hips and seat, with your feet together.
- Inseam: For trousers, measure the inside leg from crotch to the desired hem; check whether the retailer lists garment inseam or a body measurement.
- Shoulders and sleeve: Useful for structured shirts and jackets, especially when the garment has little stretch.
Fit tip: Recheck measurements occasionally and when ordering a different garment type. Do not add or subtract “extra room” unless the brand’s chart explicitly asks you to: some charts describe body measurements, while others describe the finished garment.
Body measurements vs garment measurements: what is the difference?
A body-size chart tells you which size a brand recommends for your body dimensions. A garment measurement tells you how large the actual item is when measured. They are not interchangeable. A loose sweater may have a chest measurement larger than yours by design, while a fitted stretch top may be cut closer to the body.
| What you see | What it usually means | What to check |
|---|---|---|
| Body bust: 36–37 in | Recommended wearer measurement | Compare with your own bust |
| Garment chest: 42 in | Finished item circumference | Consider ease, cut and fabric |
| “Relaxed” or “oversized” | Intended silhouette | Product photos and fit notes |
| “Stretch” or “non-stretch” | Fabric behaviour | Composition and care details |
For a real example, Fashion Nova’s published women’s tops-and-dresses chart lists size M with a 36–37-inch bust, 28–29-inch waist and 39–40-inch hips. Those figures apply to that chart—not to every Fashion Nova product or any other brand. Check the item page for style-specific fit information.
Five checks before you choose a size
1. Open the chart for the exact item and market
International size conversions can differ by brand, product and country. Start with your measurements rather than a familiar UK, US or EU number. If the product page offers its own fit calculator or measurement chart, use that before a generic conversion table.
2. Read the fabric and silhouette
Stretch knitwear, woven silk, denim and structured tailoring can fit differently even when their labelled size matches. A retailer’s words—slim, regular, relaxed, oversized—describe the intended look, not a universal measurement standard.
3. Compare a similar item you already own
Lay a well-fitting garment flat and measure its chest, waist, hips or inseam. Double a flat width only when the retailer gives a circumference; avoid comparing a flat width directly with a body circumference. This works particularly well for trousers, jackets and dresses. Workwear stores such as Allegra K show product details on each item page, so check them against your measurements.
4. Look at the model notes and useful reviews
Model height and worn size provide context, but are not enough on their own. Prioritise reviews mentioning the buyer’s measurements, garment stretch, length and whether a size change helped. Do not treat a single “true to size” comment as a guarantee.
5. Check the return cost before chasing the sale price
Sale and clearance merchandise may have different return conditions. The US Federal Trade Commission’s online-shopping guidance recommends checking refund eligibility, return windows, who pays return shipping and possible restocking fees. If a size is uncertain and the item is final sale, consider whether the risk outweighs the discount.
What about bras, lingerie and silk clothing?
For bras, start with underbust and full-bust measurements rather than clothing-letter sizes. Adore Me’s official fit guide explains how to measure around the ribcage and fullest bust, then use its band and cup charts. Its sister-size advice explains why a different band-and-cup combination can sometimes offer a similar cup volume, but fit still needs checking. For shapewear and bodysuits, compare the fit notes first, then check the current offers on our SKIMS coupon page.
For silk dresses and blouses, do not assume that a size will stretch like jersey. Some LILYSILK product pages display separate body and product measurements; compare both when available, particularly across the bust, waist and hips.
A worked sizing example: choosing between M and L
Imagine your measurements are bust 37 in, waist 29 in and hips 40 in. On the specific Fashion Nova tops-and-dresses chart cited above, those numbers sit at the upper end of the published M ranges. That does not automatically mean M is the best fit: check whether the dress is fitted or loose, whether the fabric stretches, and whether the item has its own measurements. If your measurements fall across different size rows, prioritise the body area that the garment fits most closely and read the product notes before ordering.
Where to browse fashion offers after checking fit
Once you know what to look for, compare eligible offers on the relevant TopDiscountCodez store page: Fashion Nova for trend-led clothing, LILYSILK for silk pieces, Adore Me for intimates, and Victoria’s Secret for lingerie and sleepwear. For bras and panties, Intimissimi lists $19 sale bras and panty multi-buys. You can also browse the fashion deals category. If your shortlist includes more women’s fashion or casualwear in India, also compare the fit notes on StyleWe and Bewakoof, respectively; check availability and delivery terms with the retailer.
Compare the final delivered checkout total, not just the sale badge. For a broader check on whether a markdown is genuine, read our price-history shopping guide. Store promotions and sizes can change; the merchant’s live product page and checkout terms are the final source.
Getting the size right is one step; for the rest of your pre-sale checks, use our smart shopper’s checklist.
Frequently asked questions
Should I size up when shopping online?
Not automatically. Check your measurements against the item-specific chart, fabric stretch and intended fit. Size up only when those details support it or when you knowingly prefer a looser silhouette.
Are US, UK and EU clothing sizes interchangeable?
No. Conversion charts are approximations, and retailers can use different measurements within the same labelled size. The brand’s own chart is more useful than a generic conversion.
What if my bust, waist and hips fall into different sizes?
Check which area controls the fit of that particular garment. For a fitted dress, review all three; for trousers, focus on waist, hips and inseam. If available, use garment measurements and consider tailoring or a different cut.
Does a discount code change the return policy?
It can depend on the retailer and offer. Check whether discounted or final-sale items have special restrictions before you pay; never assume a promo code preserves ordinary returns.
The bottom line
The most reliable online size guide is the combination of your current measurements, the exact product chart, fabric and fit notes, and a return-policy check. Take those few minutes first, then explore eligible store offers on TopDiscountCodez with a clearer idea of what is worth buying.
Editorial fact-check: October 13, 2026. Size charts and policies are retailer-specific and may change; confirm them on the merchant site before checkout.