Optimistic Michelle wears sunny shift dress for State of the Union

The first lady reflected optimism in her outfit for President Barack Obama's final State of the Union address. Michelle Obama wore a sleeveless, sunny yellow shift for the occasion.

With delicate loop earrings, rosy makeup and her hair in loose waves, Obama was radiant. Praise for her look flooded in on Twitter, as did a debate over how best to describe the color of the dress. Was it sunflower? Mango? Tangerine?

Designer Narciso Rodriguez called it a marigold wool crepe dress with a fitted bodice and slightly flared skirt. It retails for around $2,000, but one Twitter poster found it on sale for $628.