Kate Middleton is the queen of relatable fashion—when she's not dressing like an actual queen, that is. She recently shared multiple Instagram videos promoting her huge research project on children's first five years of life. (She even did a very cute Q&A in case you missed it.) There are many fascinating findings from the project to delve into, but I couldn't help but also notice the outfits she chose for the new videos.

To reveal one of the project's insights, the Duchess of Cambridge wore Gap's Cable Knit Turtleneck Sweater ($26), which is currently marked down from $60 but is selling out rather quickly. It's a wonderfully cheery and festive sweater yet super easy to throw on with jeans. Scroll down to see Kate Middleton's Gap sweater and shop similar pieces if it's not available in your size.

Next, the 5 leggings brands celebrities buy for themselves.