How to Measure Yourself for a Formal Dress: Step-by-Step Guide
Posted by Alice Jerry on
How to Measure Yourself for a Formal Dress: Step-by-Step Guide
Getting your measurements right is the single most important step when ordering a formal dress online — whether it's a prom gown, wedding dress, bridesmaid dress, or homecoming style. Formal dress sizing is not the same as everyday clothing sizing, and ordering based on your regular size is one of the most common (and costly) mistakes shoppers make.
This step-by-step guide shows you exactly how to measure yourself correctly, what each measurement means, and how to use our size chart to find your perfect fit.
What You'll Need
- A soft fabric measuring tape (not a metal ruler or tape measure)
- A mirror, or a friend to help
- Form-fitting undergarments or a strapless bra (wear what you'll wear under the dress)
- Bare feet or the heels you plan to wear (for height/length measurements)
- A pen and paper to record your measurements
Important: Always measure over your undergarments, not over clothing. Keep the tape snug but not tight — you should be able to slip one finger underneath.
The 5 Key Measurements for a Formal Dress
Measurement 1: Bust
What it is: The circumference around the fullest part of your chest.
How to measure:
- Wear your strapless bra or the undergarment you'll wear under the dress
- Wrap the measuring tape around the fullest part of your chest (usually across the nipple line)
- Keep the tape parallel to the floor — don't let it dip at the back
- Keep it snug but not tight. Record the number in inches or centimeters.
Common mistake: Measuring too high (across the collarbone) or too low (under the bust). The tape should go across the fullest point of your chest.
Measurement 2: Waist
What it is: The circumference around your natural waist — the narrowest part of your torso.
How to measure:
- Find your natural waist by bending slightly to the side — the crease that forms is your natural waist
- Wrap the measuring tape around this point, keeping it parallel to the floor
- Stand up straight, breathe normally, and record the measurement
- Don't suck in or hold your breath — measure as you normally stand
Common mistake: Measuring at the belly button instead of the natural waist. The natural waist is typically 1–2 inches above the belly button.
Measurement 3: Hips
What it is: The circumference around the fullest part of your hips and seat.
How to measure:
- Stand with your feet together
- Wrap the measuring tape around the fullest part of your hips and buttocks (usually about 7–9 inches below your natural waist)
- Keep the tape parallel to the floor
- Record the measurement — this is often the largest of the three measurements
Common mistake: Measuring too high (at the hip bone) rather than at the fullest point of the seat. The fullest point is usually lower than you think.
Measurement 4: Hollow to Floor
What it is: The distance from the hollow of your collarbone to the floor. This determines the correct dress length.
How to measure:
- Stand barefoot on a hard, flat surface (or wear the heels you plan to wear with the dress)
- Find the hollow at the base of your throat — the small indentation at the center of your collarbone
- Have a friend measure straight down from this point to the floor
- Stand up straight and look forward — don't look down, as this changes the measurement
Why it matters: This measurement is critical for floor-length and tea-length dresses. A difference of even 1–2 inches can mean the difference between a dress that pools on the floor and one that hits perfectly.
Tip: If you're ordering a custom length, measure with the heels you plan to wear. If you're ordering a standard length, measure barefoot.
Measurement 5: Height
What it is: Your total height from the top of your head to the floor.
How to measure:
- Stand barefoot against a flat wall
- Stand up straight with your heels touching the wall
- Have a friend mark the wall at the top of your head and measure from the floor to the mark
Why it matters: Height is used alongside hollow-to-floor to determine the correct dress length, especially for petite or tall frames.
How to Use Your Measurements to Find Your Size
Once you have all five measurements, here's how to use them:
- Go to our Size Chart and find the row that matches your measurements
- Match all three body measurements (bust, waist, hips) — don't just match one
- If your measurements fall between sizes, always size up — it's far easier to take a dress in than to let it out
- If your measurements span two different sizes (e.g., your bust is a size 6 but your hips are a size 8), order the larger size and have the smaller area altered
Important: Formal Dress Sizing vs. Regular Clothing Sizing
Formal dresses typically run 1–2 sizes smaller than regular clothing. A woman who wears a size 8 in everyday clothes may need a size 10 or 12 in formalwear. Never order based on your regular clothing size alone.
| Regular Clothing Size | Typical Formal Dress Size |
|---|---|
| XS / 0–2 | 2–4 |
| S / 4–6 | 6–8 |
| M / 8–10 | 10–12 |
| L / 12–14 | 14–16 |
| XL / 16–18 | 18–20 |
Note: This is a general guide. Always use your actual measurements against our size chart for the most accurate result.
Custom Sizing: The Best Option for a Perfect Fit
At Promfast, many of our formal dress styles are available with custom sizing at no extra charge. This means your dress is made to your exact measurements — not a standard size — for a fit that requires little to no alteration.
To order a custom size, simply provide your:
- Bust measurement
- Waist measurement
- Hip measurement
- Hollow-to-floor measurement
- Height
Custom orders typically take 2–4 weeks to produce. For prom and wedding dresses, we recommend ordering at least 3–4 months in advance to allow time for production, shipping, and any final adjustments.
Measurement Tips by Dress Type
Prom Dresses
- Measure with the undergarments and bra you plan to wear under the dress
- If ordering a floor-length style, measure hollow-to-floor with your prom heels on
- Order at least 6–8 weeks before prom to allow time for any alterations
Wedding Dresses
- The hollow-to-floor measurement is especially critical for wedding gowns with trains
- Measure with the undergarments and shapewear you plan to wear on the day
- Order 6–8 months in advance to allow time for production, shipping, and multiple fittings
Bridesmaid Dresses
- Every bridesmaid must take her own measurements — never estimate or use clothing sizes
- All dresses should be ordered at the same time to ensure color consistency
- When bridesmaids are in different cities, share this guide so everyone measures correctly
Homecoming Dresses
- For short styles, bust and waist are the most critical measurements
- For midi or tea-length styles, include the hollow-to-floor measurement
- Order 6–8 weeks before homecoming
Frequently Asked Questions About Formal Dress Sizing
What if I'm between sizes?
Always size up. It's much easier and cheaper to have a dress taken in than to let it out. Alternatively, order a custom size for a perfect fit.
What if my bust, waist, and hips are different sizes?
Order based on your largest measurement and have the other areas altered. Or choose custom sizing so the dress is made to all three of your measurements simultaneously.
How do I measure if I'm pregnant?
Measure at your current size and order a custom size if possible. Empire waist and A-line styles are the most forgiving for changing body shapes. Order as close to the event as possible for the most accurate fit.
Should I measure myself or have someone help?
Having a friend help gives more accurate results, especially for the hollow-to-floor measurement. If measuring alone, use a mirror to check that the tape is parallel to the floor.
Ready to Find Your Perfect Fit?
Use your measurements with our Size Chart to find your size, or choose custom sizing for a dress made exactly to your measurements.
Shop by occasion:
📚 Also in This Series: Dress Buying Guides
Still not sure about your size? Contact our team — we're happy to help you find the perfect fit.
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