The shoulder straps look to be 2 inches to me. The sow who choose to make a big deal out of this probably thought it meant a dress needed capped sleeves.
She ruined that beautiful girls night by making her put her coat over her Paris dress. Maybe the sow should have brought some shawls with her, to provide for the stray students who didn’t follow the rules to the letter. But providing a solution to the problem would mean the sow wouldn’t have gotten her little dictator thrills for the evening.
Wow you make a lot of assumptions about the person in charge of making sure the dress code was adhered to. If being told to cover up a dress is all this girl ever has to contend with is her idea of a ruined night she should count her blessings.