Sexy Dress

I’m having a 10 year anniversary dinner at a restaurant. Me and my husband decided we are gunna dress up. I in a dress and him in tie. Well my friend found out and says now she has to where a dress too. So she sent me a picture of what she’s gunna ware. 😱 It literally looks like a negligée. Plus her boobs are huge and I mean like a bra size H. Problems either she won’t wear a bra or she will ware a strapless one. Unfortunately strapless ones do no help for her. I just told her that it might be cold and maybe she needs something more warmer. Should I tell her the truth? That it’s not right for the dinner?