A dress fits a shorter frame when the waist seam sits on your waist and the hem lands on a landmark, not when the label says petite. Petite is cut for women 5 ft 4 in (163 cm) and under, about 2 inches (5 cm) shorter in the leg than regular, so a regular midi lands about 2 inches lower on you than intended. Here is where each length should end, why the waist seam matters more than the hem, one measuring step on a dress you already own, and the tailor's rule: hem yes, waist seam and shoulder no.
What petite means on a dress
Petite is a height band. Wikipedia defines a petite size as one "designed specifically for women 163 cm (5 ft 4 in) and under" and adds that it "takes into account the proportions of her body", not height alone. Quince describes its petite patterns as graded "with shorter inseams, shorter sleeve lengths" and "proportionally shifted waist, bust, and shoulder points". On a dress, that means the waist seam and the bust shaping sit higher, closer to where yours are.
Petite is a height band.
Take the hem up on a regular dress and only the hem moves. The waist seam, the bust dart and the shoulder seam stay where the pattern put them. That is why a shortened regular dress and a petite dress in the same size do not sit the same way. How a 4P relates to a 4 is in petite sizes explained.
Mini, midi, maxi: where each should end
The names are hem positions. Wiktionary puts a midi hemline at mid calf, a maxi at the ankle, and a miniskirt's hemline "well above the knees", generally at mid thigh. Our landmarks are tighter.
Mini. Mid thigh to just above the knee. Our test is the fitting room chair: sit down, and if you would not stand up again in company, it is a top.
Midi. Just below the knee to mid calf, in the shoes you will wear with it, and never at the widest part of the calf, the rule our trouser length guide gives for cropped trousers. In flats, take the shorter end. With a heel, mid calf.
Where should a midi end if you are short? The same place, and here is why it goes wrong. Wintergreen Northern Wear's size chart puts a size 4 at a 30 inch inseam and a 4P at 28: 30 minus 28 is 2. NYDJ's inseam guide puts petite at 28 to 30 inches and regular at 30 to 32, the same 2 inches at both ends. A regular midi is drawn to land at mid calf on a regular length leg. On a leg about 2 inches shorter, the hem lands about 2 inches lower, in the stretch towards the ankle that is neither midi nor maxi. The figure varies with where you carry your height, in the leg or the torso, which is why the measuring step below matters more than the number.
Maxi. The ankle bone, or about half an inch (1 cm) off the floor in the shoes you will wear: the trouser guide's half an inch of clearance keeps the hem clean. A maxi hemmed for heels drags in flats, so buy for the shoe.
The waist seam decides the rest
Where should the waist seam sit? On your natural waist. Our how to measure page takes the waist "around your natural waist, the narrowest point", and our quick way to find it without a tape is to bend to one side: the crease is your waist.
A midi with its waist seam at your hip is not a long dress. It is a dress cut for a longer torso, and no hem will fix it. The skirt starts too low, so in our view the midi reads as a maxi and the bodice has nothing to hold on to. Empire lines and drop waists both work on a shorter frame when the seam is where your body bends: under the bust, or at the hip bone, each on purpose. The wedding guest dress guide says the same about occasion dresses: the waist is the whole thing.
Measure a dress you already own
You need one dress that fits and a tape, not your own measurements. Lay the dress flat, zipped, and smooth the skirt. Measure from the waist seam straight down to the hem. Measure from the shoulder seam, where the strap or sleeve meets the body, straight down to the hem. Then put it on with flats and note where the hem lands: above the knee, below it, mid calf, ankle. Do it again in the heels you wear most.
Those two numbers and two landmarks are your dress length. When a brand lists a garment length, compare it with your shoulder to hem number, not your height. The difference between the two numbers is your shoulder to waist, the one that tells you whether a cut was drawn for your torso. For trousers the equivalent is the inseam, and our size guide lists one for every size, 27 inches at XXS to 29.5 at XXL.
Necklines and sleeves on a shorter frame
Square, V and scoop necks show a little collarbone and, in the words of our neckline guide, "draw the eye up". Its rule holds for any neckline: the seam should sit flat without gaping, and if it gaps the garment is too wide through the chest, not too big overall. Our rule of thumb: a long sleeve ends at the wrist bone and the shoulder seam sits on the shoulder bone. A long sleeve is the cheap fix. A wide shoulder is not.
Fabric weight and lining
In our view weight is what lets a skirt hang rather than cling. A heavy crepe holds a waist seam and falls straight from it. A bias cut satin skims and moves, which is the point of a slip. Our slip dresses are cut on the bias in a fabric with enough weight to move with you, fully lined, with straps that adjust. Ours are lined, so they fall clean over whatever you wear underneath.
What a tailor can fix on a dress
Can a tailor shorten a dress? Yes, and it is the cheap job. Our alteration tips: "Hems, sleeves and waistbands are simple and inexpensive to adjust. Shoulders, armholes and rises are not, so prioritise those when you shop." On a dress that means hems, straps and sleeves yes. Waist seam, shoulder and armhole no: in our view moving a waist seam means recutting the bodice above it, the work the page warns you off.
One caveat. A bias cut dress stretches as it hangs. Seamwork's guide to bias cut garments says to "hang those pieces for at least 24 hours before doing your final hemming" so that "the bias will relax and find its natural drape". A bias slip is a job for a tailor who will hang it first, not a weekend with pins. So: buy for the waist seam and the shoulder, pay for the hem.
How we cut ours
Our sizing runs XXS to XXL "with a focus on fit through the shoulders, waist and hip", and our alteration tips say every Petite Wears piece is designed so you can skip the tailor. Gap Factory's petite dresses page makes the same promise, "no trips to the tailor necessary". On the Marlowe Midi Dress it rests on the two things its page lists: a defined waist and "Midi length, no alterations needed". The Marlowe is a square neck midi in a heavy crepe with a fluid skirt, fully lined. The Vela Open Back Midi is the covered version: long sleeves, a soft shoulder, a deep open back, heavy stretch crepe. The Rhea Slip Dress is bias cut with a V neckline, fully lined, in a satin finish, and its adjustable straps are the length control, because a shorter strap raises the whole dress. All three are on dresses.
Buy the dress for its waist seam. A hem can be moved, a waist seam stays where it was cut.
