What would a musician of a choir tell females what they shouldn't wear?

Our musician of our choir need with us 4 yrs and 2mos. Well just our last rehearsal out of no where he told the females don't wear nothing fitted day we don't have on robes.He when goes back couple yrs ago and say someone did that a couple yrs ago and men were staring. Not to mention his wife is on the choir almost a year ago.This was never mentioned before.