Ethereal Butterfly Couture Sketches

Create high-fashion couture sketches for an "{argument name="collection name" default="Aria of Frost"}" and "Lumina Papilio" collection, featuring ethereal, butterfly-inspired evening gowns. The designs should showcase sleek mermaid silhouettes, architectural ruffled sleeves that mimic lepidoptera wings, and intricate silver filigree wirework. Use a luxurious color palette of {argument name="color palette" default="iridescent amethyst, frozen lilac, and deep cerulean blue"} accented with metallic gold and silver threads. The mood board should include technical details like fabric swatches of silk-satin, silver mesh, and seed pearl clusters, presented in a professional atelier style with elegant calligraphy and butterfly reference anatomy.