Body shape vs body type vs somatotype vs Kibbe
Four labels that get used as if they mean the same thing. They do not. Each system takes different inputs, answers a different question, and can give you a different word for the same body without either one being “wrong”.
The short version
| Label | What it takes as input | What it is for | Typical outputs |
|---|---|---|---|
| FFIT body shape | Bust, waist, high hip, hip circumferences | Clothing fit and proportional description | Hourglass, Top/Bottom Hourglass, Spoon, Triangle, Inverted Triangle, Rectangle, Oval, Diamond |
| “Body type” (fashion) | Usually bust, waist and hip; sometimes shoulders | A loose, everyday label for styling | Hourglass, pear, apple, rectangle, inverted triangle |
| Heath–Carter somatotype | Skinfolds, widths, circumferences; a trained rating | Physique description in anthropology and sport science | Endomorphy, mesomorphy, ectomorphy, each on a 7-point scale |
| Kibbe Image Identity | Bone structure, facial features, flesh; a yin/yang reading | Style direction and image identity | Thirteen Image Identities, from Dramatic to Romantic |
FFIT: the measurement system this site uses
FFIT was developed at North Carolina State University from 3D body scans. It compares four circumferences and checks a fixed set of rules. The output is a shape label, and the label is only as good as the four readings. It says nothing about your face, your personality, your health or your style identity.
“Body type”: a useful phrase with no single definition
In everyday fashion writing, “body type” usually means the five-shape family model: hourglass, pear, apple, rectangle and inverted triangle. That is close to FFIT, but not identical: the five-family version collapses the top and bottom hourglass variants, and it often uses shoulders as well as bust. When a page asks only for bust, waist and hip, it is probably running a simplified version of the same idea.
The phrase is also used for somatotypes and for Kibbe, which is why two pages can both say “body type” and ask for completely different things.
Somatotype: endomorph, mesomorph, ectomorph
The Heath–Carter method rates three components on a 7-point scale: endomorphy (relative roundness and body fat), mesomorphy (muscularity and bone structure) and ectomorphy (linearity). It is estimated from skinfolds, widths and circumferences, and it is used in anthropology and sport science. A person can be, for example, 2-5-3: low endomorphy, high mesomorphy, low ectomorphy.
This is not the same as a fashion shape. Two people with the same bust, waist and hip can have different somatotypes, and two people with the same somatotype can have different FFIT shapes. The labels are not interchangeable, and a somatotype is not a health diagnosis.
Kibbe: image identity, not a tape measure
David Kibbe’s system, published in Metamorphosis (1987), sorts people into thirteen Image Identities using a balance of yin (soft, rounded) and yang (sharp, angular) traits. The inputs are things like bone structure, facial features and the way flesh sits on the frame — not four circumferences. It is a style-direction system: the output is a family of silhouettes, fabrics and details that are supposed to harmonise with the person’s presence.
You can be an FFIT Rectangle and a Kibbe Romantic; you can be an FFIT Hourglass and a Kibbe Dramatic. The systems do not share a lookup table, and a website that claims to convert one into the other is inventing the conversion.
Why the labels disagree
- Different inputs. Four circumferences vs skinfolds vs facial bone structure.
- Different purposes. Fit vs physique description vs style direction.
- Different granularity. Five families vs nine FFIT shapes vs thirteen Kibbe identities.
- Different reliability. A tape measurement can be repeated; a yin/yang reading depends on the eye doing the reading.
What this site does, specifically
The calculator runs the FFIT rules on four measurements. It does not run a Kibbe test, a somatotype rating or a five-family simplification. If you want the exact formulas, they are on the method page; if you want the nine shapes side by side, use the chart.
Questions about the labels
Can I be an hourglass and a Kibbe Romantic at the same time?
Yes. The two systems take different inputs. FFIT compares four circumferences; Kibbe uses a yin/yang reading of bone structure, facial features and flesh. There is no official one-to-one mapping between the nine FFIT shapes and the thirteen Kibbe Image Identities.
Is one system more accurate than the other?
They answer different questions. FFIT is a measurement classification built for clothing fit; Kibbe is an image-identity system built for style direction; Heath–Carter somatotype is a physique description used in anthropology and sport science. “Accurate” only means something once you say what the label is supposed to predict.
When a website says “body type”, which system does it mean?
Usually the five fashion shapes — hourglass, pear, rectangle, inverted triangle, apple — but not always. Some pages use “body type” for somatotypes (ectomorph, mesomorph, endomorph), and some use it for Kibbe. Check what the page asks you to measure; that tells you which system it is running.
References
- Simmons, Istook & Devarajan (2004). Female Figure Identification Technique (FFIT) for Apparel. Journal of Textile and Apparel, Technology and Management, 4(1).
- Lee, Istook, Nam & Park (2007). Comparison of body shape between USA and Korean women. International Journal of Clothing Science and Technology, 19(5), 374–391.
- Heath, B. H., & Carter, J. E. L. (1967). A modified somatotype method. American Journal of Physical Anthropology, 27(1), 57–74.
- Kibbe, D. (1987). Metamorphosis: The Ultimate Guide to Style and Image.
- Parker, Hayes, Brownbridge & Gill (2021). Assessing the female figure identification technique’s reliability as a body shape classification system. Ergonomics, 64(8), 1035–1051. DOI 10.1080/00140139.2021.1902572.