Related Clues:
- Stiffly proper
- Partner of proper
- Wearing a long dress and a collar buttoned to the top, maybe
- Like schoolmarms, stereotypically
- ___ and proper
- Dainty
- With 10-Down and "and," rigidly formal
- Not at all boorish
- Highly proper
- With 55-across, clue to the remaining three words of the mystery phrase
- Showing good manners
- Proper partner?
- Extremely proper
- Saying 'Please' and 'How do you do?,' say
- Wary of curses?