Vintage 70s prom dresses were a feminine fusion of bohemian & chic Click Americana 1970s Joy Stevens Tyrian Purple Draped Knit Evening Dress with Jacket Evening dress by Madame Grs in 1978.In the 1970s, Madame Grs remained a dominant figure in haute couture, known for her exquisite drapery and timeless elegance. Her designs, often inspired by ancient 70s Boho Dress Women's Floral Tie Back Mesh Backless Floor Length Dress 1970s Slip Floral Embroidered Mesh Slit Dress Retro Stage