2009 / 2010 Winter Formal Dresses and Dress Trends. When it comes to the winter season there are so many winter formal events to attend, and while dressing up is always fun many always want to stay in trend. This winter season is all about glimmer, sequins, and shinning at formal affairs. The most popular styles in dresses include one shoulder, beaded,  sequins, lace, cut-out, dresses with bows and ones with studs. While the style of dress is always important there are many popular hue this season special for the formal affair, from black, to silver, navy, and of course red. Look below at the top dresses you can wear to your formal event.