Prom dress sizes are not the same as street sizes. A dress labeled 6 in one brand can fit like an 8 in another, so always measure yourself before ordering.
What you need
Use a soft measuring tape, wear light clothing, and stand straight. Ask someone to help so the tape stays level. Measure in inches and write the numbers down.
Bust
Measure around the fullest part of your bust, keeping the tape parallel to the floor. Do not pull it tight. This measurement decides the bodice size.
Waist
Measure around the narrowest part of your waist, usually just above the belly button. Keep one finger under the tape so you can breathe and sit comfortably.
Hips
Measure around the fullest part of your hips, about 8 inches below the waist. This matters most for mermaid and fitted styles.
If you are shopping a mermaid prom dress, the hip measurement is the one to watch. For A-line and ball gowns, the bust and waist matter more.
Reading the size chart
Match your measurements to the brand's chart, not your usual size. If you fall between two sizes, choose the larger one and plan for alterations. It is much easier to take a dress in than to let it out.
Standard vs custom sizing
Standard sizes are faster and easier to exchange. Custom sizing costs more and takes longer, but it fits your exact measurements and is worth it for formal gowns, tall frames, or hard-to-fit proportions.
Many ONTOEFY styles offer custom sizing on selected dresses. Check the product page before ordering.
FAQ
Should I size up or down for prom?
Size up. Prom dresses often have little stretch, and alterations can fix a dress that is slightly big.
How do I measure without help?
Use a mirror, keep the tape level, and measure twice. For the bust, wear the bra you plan to wear to prom.
Ready to shop? Explore all prom dresses or read our full measuring guide.
