One secret to modest dressing in the colder months is layering. However, layering can be hard to master. We’ve created this guide to help you make sure you have all the basic building blocks so that you can start layering like a pro! To conquer the basics, there are two words you need to know: Over and Under. As in, what are the essential pieces to have to layer over T-shirts, full-sleeve shirts, dresses and other clothing to make an outfit more modest, trendy and warm? And, what are the essential pieces to layer under certain cardigans, shirts, jackets, dresses and other clothing to do the same?

In Part One of this two-part series on layering, we've got the essentials explained for you! (Check out Part Two for "Rowayda's Picks" for Layered Outfits!) Click through the gallery to get started!