Dear Prudence,
My 20-year-old son “Ted” has a 19-year-old girlfriend named “Dahlia.” Dahlia is very well-endowed and rarely wears a bra. However, she does wear low-cut clothing and often looks like she’s about to fall out. The dress she was wearing last night was so small on her that it she couldn’t zip it up all the way and she was very close to a nip slip. When she walked in the door she looked at me, shrugged her shoulders and said, “I know this is a low-cut dress” as if she knew she was coming to my house, knew what my expectations were, but came looking like that anyway. Here’s my problem: She’s going on vacation with us in a week. I don’t want to seem prudish but I do want to get through to her that this type of dress isn’t appropriate for the places we’ll be going and the people we’ll be seeing. I’ll be asking her before we leave if she’s got bras in her suitcase and I am ready to leave her behind if she doesn’t or make her go out and buy a few or buy them for her. What do I do? How do I handle this without alienating her but helping her to understand that something that is fine when you’re out clubbing is not fine when you’re trying to make a good impression with your boyfriend’s family?