Thank you. I did think that people obsess too much about clothes. I am more concerned about not beng allowed in places (the real dress code) than what a bunch of strangers think of me.
Thanks for the advice about the jacket or shawl to keep warm. I think I will forego the sequins though, as I wear a 30E bra and don't want to look like Dolly Parton.
As long as I know that I won't be kicked out of public places for showing my legs above the knee, I'm alright.
I will be dining in Britannia Club.
ETA: Not dress-code related, but what do you mean when you say it gets cold on deck? I live in Northern England, so I'm used to going sleeveless and bare-legged in 68 degree F weather.