It’s the dress seen ’round the world! Today’s “Look-of-the-Day” is Kate Middleton’s most well-known outfit – her royal blue Issa dress. The famous frock sold out at Harvey Nichols within 24 hours of the couple’s engagement announcement, and copycat dresses were being created and sold everywhere! Issa is one of Kate’s favorite designers, as she seems to wear it quite frequently, and is in the running to design the bride’s gown. The commoner-turned-princess also has a passion for the color blue! theSkinnyStiletto has counted down our favorite Middleton looks for the last 10 days, and most of her outfits seem to feature shades of navy, periwinkle, sky, powder, and royal blue. Maybe because it matches her eyes? Well, whatever the reason Kate loves it, blue definitely complements her coloring. Except tomorrow, she’ll be donning white. Unless… “Something borrowed, something blue…” We wonder what azure accessory the future Mrs. Windsor will be wearing tomorrow!