Legs and thighs

Instead of changing all of society, and make all outfits skimpier in varied ways, and people’s reactions to them different, he decided on one specific small change.

• Women are incapable of comprehending they have the option of wearing opaque clothing (other than footwear) that cover more of their legs than mid-thigh, and additionally of not wearing sheer or fishnet stockings with garters or garter-belt in formal and/or professional contexts. This rule doesn’t change the way women feel about their exposed legs, or other people looking at their exposed legs, compared to a state without this rule.

Historical implication: ancient garters in all existing human cultures.
Should he maybe modify the rule to start with "from the beginning of the 20th century"? Maybe, maybe not, he will see.