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| Check | heavy fabric | lightweight fabric |
|---|---|---|
| What it is | Heavy fabric sits in a higher mass band for its use. Higher GSM usually means more mass per square metre. | See the lightweight fabric notes, not a synonym swap. |
| Feel | Often firmer, warmer, and more opaque. | Judge the peer on its own sample. |
| Mass | Mass is the defining spec. Confirm it. Do not guess. | Do not copy a GSM from one family to the other. |
| Typical use | Coats, trousers, workwear, bags, and upholstery. | Match the peer to its own end use. |
| Watch-out | Bulk, heat, and difficult sewing if needles and seams are wrong. | The peer has its own limits. Read them. |
Does every heavy fabric listing mean the same cloth?
No. Heavy fabric sits in a higher mass band for its use. Higher GSM usually means more mass per square metre. Read the published mass with the end use. Heavy shirting is still lighter than coating.
Can you skip sampling heavy fabric?
Sew a sample seam. Check bulk, needle marks, and drape.
What should stay on the brief besides the keyword heavy fabric?
Published mass, construction, end use, and seam plan. Calling any dark cloth heavy without a mass number.
