* Subjectivity: Beauty is subjective. What one person finds beautiful, another might not. There's no objective standard for "most beautiful."
* Impossibility of Comparison: It's impossible to compare every dress ever made to determine the absolute "most beautiful." There are millions, if not billions, of dresses across cultures and time periods.
* Ever-Evolving Tastes: Fashion trends change constantly. What's considered beautiful today might not be considered so in the future.
Therefore, saying a dress is "the most beautiful ever made" is a dramatic statement that is meant to emphasize its beauty but doesn't reflect a true, objective comparison.