For a crop top choose a single jersey of 160–200 GSM with 3–5% elastane, which holds shape and stays opaque. A crop top has a short cut edge, so a stable knit that does not curl at the hem matters; a rib hem solves the problem. For a more structured look, interlock of 180–220 GSM gives a fuller surface. 1x1 or 2x2 rib suits body-hugging crops. Avoid a weight that is too low, which becomes see-through when stretched.
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