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Plate 03 · Rectangle family

Rectangle Body Shape

Rectangle is the most common result in the 2003 US sample, and the shape most often described as “straight” or “athletic”. It is a proportion pattern, not a lack of shape.

Last updated 2026-10-23 · 2003 US sample 46.1% · 1 shape

What the Rectangle shape means

In everyday language, a rectangle has a straighter middle, with bust, waist and hips close in size. In FFIT, rectangle is the most common result in the 2003 US sample: the bust and hips are within 3.6 inches of each other, the waist is less than 9 inches smaller than the bust and less than 10 inches smaller than the hips.

The silhouette runs straighter through the middle. The waist is a gentler indent rather than a narrow point. That does not mean there is no waist; it means the difference between the three circumferences is smaller than in an hourglass.

How to tell

  • Your bust, waist and hip measurements are relatively close.
  • Your waist is not dramatically smaller than your bust or hips.
  • Your shoulder, bust and hip lines look similar in a straight-on mirror photo.
  • If one of the differences crosses 3.6 inches, triangle or inverted triangle may be the closer label.

The measurement pattern

The rule compares the bust–hip difference and the waist drop on both sides. A body can be a rectangle at one weight and move toward another family at another weight; the label is a snapshot.

|bust − hip| < 3.6 in · 0 ≤ bust − waist < 9 in · 0 ≤ hip − waist < 10 in

These are the FFIT rules in shorthand. The shapes are checked in a fixed order, and a body near a boundary can meet more than one. That is why the atlas treats a label as a range, not a verdict.

Sub-shapes

Rectangle

Bust and hips within 3.6 inches; waist within 9 inches of bust and 10 of hips.

What to wear

These are starting points, not rules. The goal is to choose the line, volume and seam placement you want — not to “fix” a body.

Dresses

  • Shirt dresses with a belt or tie.
  • Drop-waist dresses.
  • Column dresses with a clean line.
  • Wrap dresses if you want a defined waist.

Tops

  • Peplum or gathered tops to add curve.
  • Cropped jackets and boxy tops for a straight line.
  • Tucked-in tops with a belt.
  • Layered knits for texture.

Jeans and trousers

  • Straight and wide-leg jeans.
  • High-rise with a clean waistband.
  • Low-rise if you want a longer torso line.
  • Add a belt if you want a waist signal.

Swim

  • Belted or ruched one-pieces.
  • High-cut bikinis.
  • Straight-cut swimsuits with a seam detail.

Outerwear

  • Belted trench coats.
  • Boxy jackets for a straight line.
  • Longline coats that fall below the hip.

Styling principles

  • Decide whether you want a straight line or a defined waist; both are valid.
  • A belt, seam or tuck can create a waist signal without changing the body.
  • Texture and layering can add dimension to a straight line.

Common mistakes

  • Assuming rectangle means “no shape”. The measurements still have a pattern.
  • Forcing a waist with a tight belt if you prefer a straight line.
  • Buying a size up to create volume. The shoulder fit is the constraint in most garments.

What this page is not

This page is a visual and styling reference, not a calculator. It does not diagnose health or rank bodies.

A shape is a description of proportions. It is not a health measure, an attractiveness score or a permanent identity. If a label stops being useful, leave it.

Rectangle questions

Is rectangle really the most common shape?

In the 2003 SizeUSA sample of 6,318 US women, 46.1% were classified as rectangle. That is one US sample from 2003, not a global average, but it is the largest group in that dataset.

What is the difference between rectangle and hourglass?

In an hourglass, the bust and hips are close and the waist is at least 9 inches smaller than the bust or 10 inches smaller than the hips. In a rectangle, the waist drop is smaller, so the middle reads straighter.

How do I create a waist if I want one?

A belt, a wrap, a seam or a tuck can create a waist signal. You do not need a garment that compresses the body. Choose the amount of definition you want, then pick the seam or accessory that gives it.

Sources

  1. Simmons, Istook & Devarajan (2004). Simmons, K., Istook, C. L., & Devarajan, P. (2004). Female Figure Identification Technique (FFIT) for Apparel. Journal of Textile and Apparel, Technology and Management, 4(1). https://www.ergo-eg.com/uploads/books/devarajan_full_106_04%20(3).pdf
  2. Lee, Istook, Nam & Park (2007). Lee, J. Y., Istook, C. L., Nam, Y. J., & Park, S. M. (2007). Comparison of body shape between USA and Korean women. International Journal of Clothing Science and Technology, 19(5), 374–391.
  3. Sokolowski & Bettencourt (2020). Sokolowski, S. L., & Bettencourt, C. (2020). Modification of the Female Figure Identification Technique (FFIT) Formulas to Include Plus Size Bodies. Proceedings of 3DBODY.TECH 2020. DOI 10.15221/20.22. https://doi.org/10.15221/20.22
  4. Parker, Hayes, Brownbridge & Gill (2021). Parker, C. J., Hayes, S. G., Brownbridge, K., & Gill, S. (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. https://doi.org/10.1080/00140139.2021.1902572
  5. Istook / SizeUSA distribution (2005). North Carolina State University (2005). Fashion designers ignoring shapes of women’s bodies. Newswise / NC State news release; Newcomb, B., & Istook, C. (2006). Using SizeUSA to improve apparel fit. https://www.newswise.com/articles/fashion-designers-ignoring-shapes-of-womens-bodies

Corrections: [email protected] · 2026-10-23

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