See how a fabric behaves before you buy it

What is fabric weight?

Weight tells you how heavy a square yard or meter of fabric feels. It is measured in GSM (grams per square meter) or ounces per square yard. A higher number means a thicker, heavier fabric. Weight affects how a garment hangs, how warm it feels, and what kind of needle and thread you need.

Sheer (under 60 GSM)

Organza, chiffon, tulle, gauze. These are see-through and very light. Best for overlays, veils, and gathered details.

Light (60-120 GSM)

Voile, lawn, batiste, lightweight rayon. These drape softly and work for blouses, summer dresses, and linings.

Medium (120-200 GSM)

Poplin, chambray, cotton sateen, crepe. Good for shirts, structured dresses, and pants with some body.

Heavy (200+ GSM)

Denim, canvas, coating wool, upholstery fabric. These hold shape well and are used for jackets, bags, and home decor.

What is drape?

Drape describes how a fabric falls under its own weight. A fabric with soft drape (like silk charmeuse) flows and clings. A fabric with stiff drape (like organza) holds its shape and stands away from the body. The drape coefficient in this visualizer ranges from 1 (very fluid) to 10 (very stiff).

Drape is not the same as weight. A heavy fabric can still drape softly if the fibers are fine and the weave is loose. A light fabric can be stiff if it is tightly woven or treated with starch.

Common mistakes when choosing fabric

• Ignoring the pattern recommendation. If a pattern says "lightweight woven," do not use a heavy denim. The finished garment will not fit or hang the way the pattern drawings show.
• Confusing drape with stretch. A fabric can drape well without stretching (rayon crepe) and stretch well without draping (jersey with spandex). Check both properties.
• Choosing by color alone. A beautiful print on the wrong fabric weight will disappoint. Always check weight and drape first, then find the color you want in the right category.
• Forgetting about fiber content. Two fabrics at the same weight can behave very differently. A polyester crepe will not breathe like a rayon crepe. A cotton jersey will recover differently from a synthetic blend.

Substitution guide

When your first-choice fabric is unavailable or too expensive, look for a substitute in the same weight category with a similar drape coefficient. Here are reliable swaps:

Knit vs. woven: why it matters

Knit fabrics are made from interlocking loops, which gives them natural stretch and recovery. Woven fabrics are made from threads crossing at right angles, which gives them stability but less stretch. Even at the same weight, a knit will drape more softly and stretch on the bias. When substituting, try to match the fabric type as well as the weight.

Patterns designed for knits account for stretch and negative ease. Patterns designed for wovens include ease for movement. Using a knit in a woven pattern (or vice versa) can change the fit significantly.

How to use this visualizer

1. Type a fabric name in the search bar or tap a weight filter.
2. Click a fabric card to see its full profile, including drape, stretch, and best uses.
3. Use the "Compare" button on two fabrics to see them side by side.
4. Print the comparison or the project worksheet below to take to the fabric store.
5. Save your project plan in the worksheet section for next time.