Garment measurements held against Shopify products reach Faslet, so a size recommendation is built on what the garment actually measures rather than on whatever label happens to be sewn into it.
A size label is a marketing decision. A measurement is a fact, and only one of them helps somebody decide whether a jacket will fit. Size tools are often judged on the recommendation and the recommendation is only ever as good as the measurements behind it, which is why so many of them get switched off after a season. If the data going in is a list of sizes with no dimensions, the advice is confident and useless, and returns go up rather than down. The Shopify to Faslet integration is mostly about getting real measurements across for every variant.

Real dimensions for each variant reach the fit tool, so a recommendation is based on what the garment measures rather than on a size label that varies between suppliers.
Shoppers who are advised accurately order the size they keep, so return rates fall because the advice was good rather than because fewer people were ever shown any.
Alumio reaches Faslet over the interface it makes available, the same way it reaches any system with one, so a fit tool is not a special case somebody has to build around.
Measurements travel with new products as they are created, so a range launches with fit advice already working instead of gaining it weeks later once somebody backfills the data.
Product measurements held against each Shopify variant reach Faslet as products are created and updated, so the advice a shopper sees reflects the actual garment in front of them rather than a category average.
A product without measurements shows up as a gap rather than quietly receiving generic advice, so somebody adds the real numbers before the line goes live and starts quietly generating returns that nobody wanted.
A supplier revises the cut of a garment, the measurements change in one place, and the fit advice updates with them, so nobody is left maintaining a second set of dimensions in a separate spreadsheet somewhere.
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A product information system usually has to come first rather than second, because measurements have to live somewhere before they can be sent anywhere, and a spreadsheet is not that place once a range grows. Once they are held properly, the fit tool and the storefront both read from the same set of numbers.
Yes, though whether it helps depends on the data before it depends on the sync. Measurements have to exist per variant and be accurate, because a fit tool given size labels alone will produce advice anyway and it will be wrong. Alumio publishes what you hold, and flags products where the measurements are missing.
No, and in practice the person setting this up is usually in merchandising rather than development, because the hard part is deciding which measurements matter for which category. Those choices sit in a form. The Code Transformer is there if a conversion between two suppliers' measurement formats needs writing.
Measurements per variant, and the honesty to say nothing when they are missing. A fit tool with real dimensions helps somebody choose between two sizes. The same tool given only labels produces advice that sounds equally confident and is guesswork, which costs more than showing nothing at all, because a shopper who was advised badly returns the item and remembers it.
Bad advice is worse than no advice, so a product whose measurements never arrived is listed as a gap rather than quietly given generic sizing anyway. Alumio spots each failure as it happens, logs the product and variant it was carrying, and alerts immediately with the reason Faslet would not accept it. Retries run where configured.
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