When sourcing pleated skirts, the most critical technical factor is pleat retention. You should prioritize fabrics with a high polyester content (at least 65-100%) because synthetic fibers hold heat-set pleats much longer than natural fibers. Additionally, verify the fabric weight (GSM) to ensure opacity and drape; for summer collections, 120-160 GSM is standard, while winter versions require 250+ GSM. Ensure the use of high-temperature vacuum pleating machines to prevent pleats from disappearing after the first wash.