The poster for a 1920’s themed restaurant opening in California advised male customers that collared shirts were preferred, and female customers that heels were required. This was so important that they used space on their grand opening marketing poster (below) to write "Ladies: No flat shoes or sandals. Must have heels. Exception will be made if injured." Seriously.
Dress codes are tricky and all too often used to enforce all manner of bigotry and sexism, including the idea that women should always dress in a way that is most likely to make men want to have sex with them. So congratulations to the people who spoke out against this so quickly, and good for ProAbition for realizing their error and making the change. Let's think twice before we make any future silly policies, okay boys?