Most petite shopping advice is a list of brand names. That is the least useful part of the answer, because the question is never “who does petite”. It is “who publishes a 26-inch inseam in a trouser I can wear to work, and can I check the measurements before I order”.
So this tool filters on the things that decide fit: the shortest inseam a brand actually publishes, whether the petite range is redrafted or merely shortened, whether per-garment measurements exist to check against, and which categories are a genuine strength rather than a token listing.
Every result shows its reasoning. Where a brand matches, you see which criterion it met and on what basis; where the data does not exist, it says so rather than guessing. Nothing here is a guarantee about a garment. It is a shortlist of places worth checking, built from what brands publish.