sh ▁cost ume ▁was ▁worn ▁just ▁to ▁please ▁visitors , ▁but ▁it ▁possible ▁that ▁this ▁happened . ▁ ▁The ▁young ▁women ▁who ▁adopted ▁the ▁cost ume ▁for ▁special ▁events ▁from ▁the ▁ 1 8 8 0 s ▁were ▁seen ▁as ▁the ▁spirit ▁of ▁the ▁new ▁Wales ▁and ▁the ▁cost ume ▁became ▁associated ▁with ▁success , ▁especially ▁after ▁the ▁Wel sh ▁Lad ies ’ ▁Ch oir , ▁dressed ▁in ▁Wel sh ▁cost ume , ▁won ▁a ▁prize ▁at ▁the ▁Chicago ▁World ▁Fair ▁E isted df od ▁World ' s ▁Columb ian ▁Ex position ▁in ▁ 1 8 9 3 ▁and ▁went ▁on ▁to ▁sing ▁for ▁Queen ▁Victoria ▁and ▁performed ▁at ▁concert s ▁throughout ▁Britain . ▁ ▁The ▁modern ▁cost ume ▁The ▁modern ▁cost ume ▁worn ▁by ▁girls ▁on ▁St ▁David ’ s ▁Day , ▁which ▁used ▁to ▁be ▁made ▁by ▁moth ers ▁from ▁old ▁cost umes , ▁is ▁now ▁commer cially ▁available . ▁The ▁design , ▁colours ▁and ▁use ▁of ▁la ce ▁( which ▁was ▁very ▁rarely ▁associated ▁with ▁Wel sh ▁cost ume ▁during ▁the ▁ 1 9 th ▁century ), ▁may ▁well ▁be ▁derived ▁from ▁cost umes ▁made ▁especially ▁for ▁those ▁compet ing ▁at ▁the ▁International ▁E isted df od au ▁at ▁L lang ol len ▁( est ab lished ▁in ▁ 1 9 4 7 ) ▁and ▁other ▁events ▁where ▁d anc ers ▁required ▁a ▁comfortable ▁and ▁practical ▁cost ume ▁which ▁was ▁distinct ▁from ▁those ▁worn ▁by ▁represent atives ▁from ▁other ▁nations . ▁The ▁cost ume ▁now ▁generally ▁worn ▁by ▁dance ▁teams