When Viloet, Dash and ElastiGirl are in the cave in the forest Violet put her hair up. Where did she get her hair band from ? And how does it go invisible when violet does ?
Is it not possible that this was not included with her costume? The lady who made them, Edna, probably added little things to all the costumes. There might be little pockets and stuff in the costumes that she added, just in case something happened in the future, and to hide little surprises like that.