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Why Cardigans Have Their Own Fit Rules
A cardigan is a layering piece, so it has to fit over a top, drape nicely, and — if it buttons — close without straining. Add in that it's knit, which stretches and relaxes, and you have a garment the size label can't really describe. Measuring flat is the dependable way to know how it'll wear.
What You'll Need
- A flat surface.
- A tape measure.
- The cardigan laid flat, buttoned if you want a closed-fit reference, smoothed out.
The Measurements That Matter
- Chest (pit to pit): Across from underarm to underarm, doubled. Allow room for the layer underneath.
- Length: From the highest shoulder point to the hem — cropped, hip-length, or longline.
- Shoulder: Seam to seam (drop-shoulder styles will sit past your shoulder).
- Sleeve: From the shoulder seam to the cuff.
Measure the knit relaxed, since it stretches.
Knit Behavior Changes the Fit
Cardigans are knit, so they stretch under wear and can relax or grow over the day — the behavior we explore in Why Knitwear and Sweaters Are Hard to Size. A finer-gauge cardigan drapes close; a chunky one adds bulk and structure. Factor the knit's weight into how the flat measurement will actually wear.
Layering Room Matters
Because it goes over other clothes, a cardigan needs chest ease for the layer beneath — the same layering logic as outerwear in How to Measure a Jacket. If you wear it open as a drape, ease matters less; if you button it over a shirt, give it room.
How to Use the Measurements
Measure a cardigan you reach for constantly and use its chest, length, and sleeve as targets. Decide the silhouette you want — cropped, classic, or longline — since length defines the look as much as the size.
Common Mistakes
- Measuring the knit stretched — keep it relaxed.
- Forgetting layering room in the chest.
- Ignoring length — it sets the whole silhouette.
Where YourSizer Fits
Cardigans combine knit stretch, layering, and preference — too much for a flat label. YourSizer factors the fabric and fit preference into a recommendation, so it layers and drapes the way you want. See it for brands, shoppers, or pricing.
Sources
- Shopify apparel size charts
- Statista global apparel market
Frequently Asked Questions
How do you measure a cardigan for size?
Lay it flat and relaxed, then measure chest (pit to pit, doubled), length (high shoulder to hem), shoulder (seam to seam), and sleeve (shoulder seam to cuff). Allow chest room for the layer you'll wear underneath.
Should a cardigan fit loose or fitted?
It depends on how you wear it. For layering over tops or buttoning over a shirt, allow extra chest room. For a close, draped look worn open, a slimmer fit works. Knit stretch gives some flexibility either way.
Do cardigans stretch out over time?
Many do, especially looser and chunkier knits, which relax with wear and can grow under their own weight. Following the care instructions and folding rather than hanging heavy knits helps them keep their shape.