I'm doing private dining with friends in a posh Pall Mall club. Since being back at work have put on weight and do not want to leave my arms out. Will probably wear a Phase 8 dress - black or dark green. Am 16 - 18 and 5'10. Can I wear a cardigan? Don't want to faff with a scarf while eating dinner. Please help - it's for tomorrow and am very much the country bumpkin at the moment.