Mistletoe and (A large) wine: Seven-fold increase in wine glass size over 300 years. Our Georgian and Victorian ancestors probably celebrated Christmas with more modest wine consumption than we do today -- if the size of their wine glasses are anything to go by. Researchers have found that the capacity of wine glasses has increased seven-fold over the past 300 years, and most steeply in the last two decades as wine consumption rose. Source 1w.