For knitted dresses choose single jersey of 160–220 GSM with elastane, or interlock of 200–260 GSM if you want a firmer drape and a more elegant look. Dresses need opacity and drape, and a fabric that is too thin clings and shows every seam. For sweatshirt-style or casual dresses, french terry of 240–280 GSM is comfortable and structured. A blend with a little viscose or modal gives a pleasant fluidity, but check shrinkage. Ask to see the sample draped on a mannequin, not just laid on a table.
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