Knit fabric is stretched during knitting, finishing and rolling, and then tends to recover. If you cut immediately, pieces shrink after cutting or in the wash and measurements go wrong. Unroll the fabric and let it lie flat without tension, ideally 12–24 hours, longer for stretchy materials. Then cut without pulling it. A simple test: mark a square on a relaxed piece and measure it after washing to set your allowance.
Why should I relax knit fabric before cutting?

relaxingcuttingknit
Buying wholesale & deliveryHow long is a quote valid and why do prices change?
A quote has a written validity period, after which the price may be revised.
Buying wholesale & deliveryWhat should an order confirmation or proforma invoice contain?
An order confirmation or proforma invoice should contain the article and composition, weight and width, the colour or shade code, quantity in kg, price per kg and…
Buying wholesale & deliveryHow do I approve a sample before series production?
Approve the lab dip first for colour and then, if possible, a production sample or a small first lot, which you compare against your standard.