A little light hearted advice would be much appreciated.

My younger Sister is getting married next year and we are off to a bridal boutique on the hunt for the one gown to rule them all shortly.

Given this is a fashion forum I would love to know, what are the dos and don'ts of gown critiquing? Is honesty really the best policy? Did you employ your best poker face? Was the champagne a help or a hindrance?

Thank you