Snagfit finds the garment that matches a photo. Whether that garment fits the person buying it is a question the photo never answers, and it gets decided somewhere else entirely: the size chart on the retailer's own product page.
That distinction matters more than it sounds like it should, because a lot of the disappointment with buying clothes from a photo comes from treating a good match as the same thing as a good fit.
Why is a size label not enough on its own?
Because size labels are not standardised across brands, and the gap can be larger than people expect.
A size medium top at one retailer might measure 96 centimetres at the chest. A size medium at a different brand might measure 102. Both are labelled the same, and a person choosing based on the label alone has no way to know which one will actually fit closer.
This is why the chart matters more than the label. Every retailer publishes its own measurements, usually as a table of body or garment dimensions against size labels, and that table is specific to that brand's own pattern. Comparing your body measurement directly against those numbers removes the guesswork that comes from assuming your usual size carries across.
What measurement should you actually take?
Whichever one the garment's fit depends on most, and it is usually one measurement, not all of them.
For a top, a dress or anything fitted at the upper body, that is the bust or chest measurement, sometimes alongside the shoulder width for anything structured. For trousers, shorts or a skirt, it is the waist and the hip. For outerwear, it is the chest measurement taken over whatever you plan to wear underneath it, since a coat measured against a bare-chest number will run tighter than expected.
Taking that single number with a tape measure and comparing it to the chart's stated range for each size is a five-minute step that resolves most of the uncertainty a photo match cannot.
Does the fabric change how closely you need to match the chart?
Yes, and this is the part a numeric chart alone does not communicate.
A rigid woven fabric, meaning cotton, denim or a non-stretch synthetic with no elastane, has essentially no give. A measurement close to the edge of a size range in that fabric is a real risk of the garment not closing or sitting uncomfortably tight.
A knit fabric or anything containing elastane has built-in stretch, so a measurement near the top of a size range is more forgiving. The chart's numbers describe the garment flat, not how it behaves once worn, and stretch is the variable that decides how much slack exists between those two states.
If the product description lists a fabric content, checking for elastane or spandex alongside the size chart gives a fuller picture than the chart on its own.
What does the chart not tell you?
Cut and ease, both of which are decisions the pattern maker made and neither of which shows up as a number.
Two garments with identical chart measurements can fit completely differently, because one has more ease built into the design, meaning extra room beyond the body measurement for a looser silhouette, while the other is cut close to the body at the same stated size. A chart cannot represent that difference, since it only states finished measurements or body measurements, not how loosely or tightly the fabric is meant to sit against them.
This is what reviews mentioning fit are for. A retailer's customer reviews or its own size guide notes, when they say something runs large, runs small, or is true to size, are describing exactly the gap that a chart's numbers cannot close on their own.
Should you size up when you are between two sizes?
It depends on the fabric and the garment type, and this is where the earlier point about stretch comes back into play directly.
In a structured, non-stretch garment, sizing up when you are between two measurements is usually the safer choice, since a loose fit is more comfortable and more adjustable than a garment that does not close properly. In a stretch fabric, staying at the smaller size often works fine, because the fabric closes the small gap the chart shows between your measurement and that size's stated range.
Some retailers state this directly in their own size guide, noting that a particular style "runs small" or "has stretch, order your usual size." That guidance, when it exists, is worth more than a general rule, since it is specific to that garment's actual pattern.
Do international size charts convert cleanly?
Not by a fixed formula, no.
US, UK, EU and Japanese sizing systems use different base numbers for what can be the same body measurement, and the relationship between them is not a consistent offset across every brand and every garment type. A UK 12 does not convert to the same US number at every retailer, because the underlying pattern differs brand to brand even within the same country's system.
The more reliable path is the retailer's own chart stated in inches or centimetres, since that is an actual measurement rather than a converted label. When a size chart gives both a label and a measurement, use the measurement and treat the label as a convenience rather than the deciding factor.
What if the retailer publishes no size chart at all?
Treat that as a reason for caution rather than something to work around.
A size chart is one of the more basic pieces of information a legitimate clothing retailer publishes, since sizing customers correctly is directly in the retailer's own interest. A store selling clothing with no measurements published anywhere on the product page gives a buyer nothing concrete to check fit against, and that absence is worth weighing alongside the other signals in is this online store legit, rather than treated as an isolated inconvenience.
Does the matched photo help with fit at all?
Only indirectly, since it answers a different question than the chart does.
The photo Snagfit matched shows the general silhouette: whether a garment sits loose, fitted, oversized or cropped on the person photographed. That silhouette is worth comparing against how the same style appears in the retailer's own product photos, since a retailer photographing a garment on a model of a stated height and size gives you a second visual reference point.
What the photo cannot do is substitute for the numeric chart, because the same general style, oversized jumper, fitted dress, wide-leg trouser, can be cut differently at different sizes even when the overall shape looks similar across a range of photos. The photo tells you the intended look. The chart tells you which number gets you there.
Does the return policy matter as much as the chart?
Yes, and the two work together rather than as separate concerns.
Even a careful measurement against a well-read chart can end in a garment that does not fit as expected, because fit also depends on personal preference for how loose or tight something feels, and no chart accounts for that. A clear, accessible return policy is what makes a measurement-based guess low-risk rather than final.
Before buying anything sized from a photo match, it is worth locating the retailer's return window, whether it covers sale items, and whether returns are free or come with a deduction, the same checks covered in what to check before you buy from a result. A retailer with a generous return policy makes the size chart step lower-stakes: get close with the measurement, and the return policy covers the rest of the gap if the fit is off.
Does buying two sizes ever make sense?
Sometimes, specifically when a chart puts you exactly between two sizes and the garment has no stated stretch information.
Ordering both sizes, trying them on at home, and returning the one that does not fit costs more upfront but removes the guesswork entirely. This only makes sense with a retailer whose return policy covers it without a fee, so checking that policy before placing a two-size order is worth doing first rather than after the parcel arrives. For a low-cost item, this is rarely worth the shipping and handling involved. For a higher-priced piece where getting it wrong is expensive to fix, it is often the more reliable route than trusting a chart measurement alone.
What is the actual sequence worth following?
Match the garment first, then measure, then check the chart, in that order.
Snagfit's job ends once it has shown you where a garment like the one in your photo is sold. From there, taking one relevant body measurement and reading it against that specific retailer's chart, rather than assuming a familiar size label carries over, is the step that decides whether the garment actually works once it arrives. It takes a few minutes, and it is the difference between a match that looks right and a garment that fits.