The Costuming Team had very little budget, so they just asked the cast members to come up with their own costumes. Since the show was set in the early 1960's, they figured our 1998 cast could easily find wardrobe items that would work. They just gave direction by saying the men should wear "business attire" and the girls should wear dresses. From my vantage point in the pit, I could tell that the kids really had no idea what people wore on Wall Street in the early 1960's.
Once, I couldn't help butting in, though. (Tried not to interfere, but I just couldn't help it!) One scene was particularly hard on my eyes. The girls wore many solid color dresses in jarring bright colors and stood very close together. There were some major color clashes going on --- hot pinks with fiery oranges standing next to each other. So I quietly asked one girl that I knew had a lovely turquoise dress if she would exchange that for her hot pink dress in this scene. She did and it helped a lot!