1. Cotton lycra jersey fabric is a cotton-rich knit fabric with Lycra/spandex added for stretch recovery. For B2B buyers, the safest specification starts with finished GSM, cotton/spandex ratio, stretch direction, recovery target, shrinkage limit, and color fastness grade.
2. For T-shirts and childrenswear, 160-220 GSM with 3-5% spandex is usually practical. For leggings, fitted dresses, underwear, and active casualwear, 220-260 GSM with 5-8% spandex gives better opacity, body hold, and shape retention.
3. The most expensive mistakes are vague RFQs, poor recovery after washing, and accepting greige GSM instead of finished GSM. Because cotton relaxes and spandex responds to heat-setting, buyers should require bulk tests per ASTM D2594, AATCC 135, ASTM D3776, and AATCC 61 before shipment.