When sourcing millinery, the choice of base material determines both the price point and the target season. For autumn/winter collections, prioritize 100% wool felt or luxurious fur felt (rabbit or beaver) which offer superior shape retention and water resistance. For spring/summer, look for Sinamay (abaca fiber), Parasisal straw, or Toyo straw. Ensure the GSM (grams per square meter) of the fabric or the tightness of the straw weave is consistent to prevent sagging. High-end millinery should also feature grosgrain inner sweatbands and wired brims (using plastic-covered millinery wire) to allow for adjustable styling and structural integrity.