Mini, midi, and maxi are not fixed measurements — they are proportions. Here is exactly where each one should land on a frame 5'4" and under.

Every length on a size chart is written for a 5'8" fit model. Ask two brands for a midi and you will get two hems four inches apart. For a woman who is 5'1", that four inches is the difference between a dress that lengthens her leg and one that cuts it in half.
The measurement that matters is HPS to hem — high point of shoulder, straight down the front of the garment, to the bottom edge. Here is the petite range for each length, alongside the regular-size equivalent.
A regular mini often lands mid-thigh on a 5'2" frame — shorter than intended. Petite minis are cut so the hem clears the knee without becoming a tunic.
The most forgiving length for a shorter frame, because it ends at a natural narrow point in the leg rather than cutting the calf.
The length that goes wrong most often. A regular midi lands at the ankle on a petite frame and shortens the leg line dramatically.
A maxi should skim the floor, not pool on it. Petite maxis are shortened through the skirt panel so the waist seam stays at the natural waist.
To use these numbers, measure a dress you already own and love: lay it flat, find the highest point of the shoulder seam, and run the tape straight down to the hem. That single number tells you more than any size letter, and it travels with you from brand to brand.
One caveat: torso length changes everything. If your legs are long relative to your body, you can carry the upper end of each range. If your torso is long, stay at the lower end so the hem does not swallow your shin.
Every Nectar piece lists HPS to hem per size, cut to the petite ranges above — so the length you see on the model is the length you will get.
Our size guide lists full garment measurements for every piece, including hem length by size.

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How to choose a dress that flatters a petite frame from ceremony to reception.

A quiet argument for buying fewer dresses, better made.