Old Navy Fit & Flare Rib-Knit Long-Sleeve Mini Dress A red Old Navy Fit & Flare Rib-Knit Long-Sleeve Mini Dress ($20, originally $35) gets our top pick for a casual Christmas dress, but the style comes in oatmeal and forest green, too. Image Source: oldnavy.gap.com Old Navy Fit & Flare Rib-Knit Long-Sleeve Mini Dress $20 from oldnavy.gap.com Buy Now