Thanks for sharing your perspective. Your comment has broadened my perception of sexism beyond "Can this person win in court?"
> If a Male manager told her she probably isn't doing well because of how she dresses (and she dresses reasonably) that would be sexism, so it's the same thing if it's another women doing it.
Yet, this isn't what happened! ;-)
According to the author's own words. Manager in a 1:1 a) asked if the author noticed the lack of eye contact with the other manager b) tentatively asked if the author thought it was because of the tank top and c) suggested the author wears long sleeves. The author's convinced the tank top isn't an issue because she gets ice cream with the subordinates.
To me, the author's drawing wild conclusions. Maybe her manager knows something or heard another manager make an off-hand comment about the dress code. I would appreciate that advice so I can decide for myself whether to make a simple adjustment to my wardrobe.