Most long prom dresses are cut for one length, then hemmed to fit. That works out for a lot of people. If you are petite or tall, it is where the trouble starts. Petite shoppers end up paying to remove a lot of fabric, sometimes from places that are hard to shorten. Tall shoppers find dresses that stop above the floor, with no fabric left to let down.
Both problems are solvable. They just need a little math before you fall in love with a dress, and a few questions most shoppers never think to ask.
Hollow to hem, and why the measuring point matters
The key number is your hollow-to-hem: the distance from the hollow at the base of your neck, between your collarbones, down to where you want the hem to land. Measure it standing straight in the shoes you plan to wear, with someone else holding the tape. Our guide to prom dress sizing walks through it step by step.
Then compare it to the dress. This is where people get caught out, because designers and shops do not all measure dress length from the same spot.
- Jovani's size chart measures length from the top of the shoulder, at the center where a seam would sit, down to the hem.
- Mac Duggal product pages also give length from the top of the shoulder to the bottom hem.
- A Finer Moment, a Spokane, Washington shop listed on this site, measures from the collarbone. Its FAQ says long dresses average 57 to 60 inches from the collarbone to the hem.
A shoulder measurement will usually be longer than a hollow-to-hem measurement on the same dress, because the shoulder sits higher. So before you compare numbers, check where each one starts. When in doubt, ask the shop to measure the actual dress from the same point you measured yourself.
The hem math
A made-up example shows how it works. Say your hollow-to-hem in your prom shoes is 58 inches, and a dress measures 61 inches from the same point. You need 3 inches taken up, a routine hem on a simple skirt. If your number is 53 and the dress is 61, that is 8 inches. Still possible on many dresses, but a bigger job, and worth checking with a tailor before you buy.
Now flip it. If your number is 63 and the dress is 60, the dress is 3 inches short. That is a much harder problem, because a hem usually cannot be let down. Sherri Hill's size guide says there is usually little extra fabric in the hem to let down, and lists adding length among the alterations that are harder to do.
What makes a hem hard to shorten
Taking a few inches off a plain chiffon or satin skirt is everyday tailoring. Some dresses are much more involved, and cost more to hem.
- Beading or sequins at the hem, which have to be removed and re-sewn by hand.
- Lace edges, scallops or appliqués, which are often moved up rather than cut.
- Many layers of tulle, since each layer is hemmed separately.
- Horsehair braid or stiffened hems on full skirts.
- Mermaid and trumpet flares. Take too much off the bottom and the flare shrinks or starts in the wrong place, so a tailor may shorten from higher up instead.
- High-low and asymmetric hems, which have to keep their shape.
- Trains, which may need a bustle as well.
If a dress has any of these and needs a lot of length removed, ask a tailor for a quote before you buy it. Our page on prom dress alterations covers costs and timing.
Petite, beyond the hem
Petite sizing is about height and proportion, not dress size. A petite shopper can wear any size, and the length problem is the same at a 2 or a 22.
Length is not the only thing that changes, though. On a shorter frame, a standard bodice can be too long, so the waist seam drops below your natural waist. Straps can sit loose. A slit or a neckline can land in a different place than it does on the model. Watch for these in the fitting room.
- Find the waist seam. If it sits well below your natural waist, ask whether the bodice can be taken up at the shoulders or straps. Sherri Hill's guide notes that straps can be shortened so the bodice sits where it should.
- Look at volume. A very full skirt or a long train is a lot of fabric on a smaller frame. That may be exactly what you want. Just know it will cost more to hem.
- Check the empire waist. A seam right under the bust can work well, since it sits in roughly the same place on most people.
- Consider short and knee-length styles. They avoid most hemming, and a short dress often lands a little longer on a petite frame.
Some labels cut separate petite versions. Mac Duggal sells petite fit versions of some of its gowns, marked with a P. On the style pages we checked in October 2026, a regular gown listed about 60 inches from the top of the shoulder to the hem, while its petite version listed about 56. One petite style we looked at was offered in sizes 0P to 16P. Mac Duggal's line leans toward evening wear, but plenty of evening gowns go to prom.
Tall, and running out of fabric
For tall shoppers, the first rule is simple. Check the length before you check anything else. A dress that fits everywhere but stops at your ankle cannot be fixed by a tailor in most cases.
A few ways around it:
- Ask about extra length. Some shops mention it as an option. A Finer Moment's about page says it offers some extra length alongside sizes 0/0/0 to 32. Simpson's Bridal and Formal, a Monroe, North Carolina shop listed here, says on its policies page that extra length carries an additional charge. Whether it exists depends on the designer and the exact style, so ask about that style specifically.
- Choose your shoes with the hem in mind. A dress that is too short in heels may be right in flats. Decide before your first fitting, and bring those shoes.
- Pick a style that is meant to show your ankles. High-low hems, ankle-length dresses and short dresses make the length question disappear.
- Check the torso, too. On a long torso, a waist seam can land above your natural waist. Sheaths, columns and empire waists are more forgiving, since they do not rely on a seam at one exact spot.
There is a dress code wrinkle as well. A dress hangs from your shoulders, so on a taller body a slit and a short hem both land higher on the leg than they do on someone shorter. If your school measures slits or hems, test them on you, not on the hanger. Our guide to whether your dress will pass dress code shows how.
Ordering and timing
A dress ordered in a petite cut or with extra length is usually a special order, and special orders are often final sale. Have the shop confirm the measured length in writing, along with any extra charge and the expected arrival date. Then leave time for a fitting, since even a dress made longer or shorter will need a final hem.
When you are ready to try things on, you can browse prom shops by state. Call first and ask two questions. Do you carry any petite cuts or extra-length styles? And does your tailor have experience shortening beaded or layered hems?